Relevant bibliographies by topics / STS [Scanning tunneling spectroscopy]

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'STS [Scanning tunneling spectroscopy]'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "STS [Scanning tunneling spectroscopy]"

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Morita, Seizo, Yutaka Maita, and Yoshiaki Takahashi. "Scanning Tunneling Potentiometry/Spectroscopy (STP/STS)." Japanese Journal of Applied Physics 28, Part 2, No. 11 (November 20, 1989): L2034—L2036. http://dx.doi.org/10.1143/jjap.28.l2034.

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Kano, Shinya, Tsukasa Tada, and Yutaka Majima. "Nanoparticle characterization based on STM and STS." Chemical Society Reviews 44, no. 4 (2015): 970–87. http://dx.doi.org/10.1039/c4cs00204k.

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Alam, MS, FA Chowdhury, RW Saalfrank, AV Postnikov, and P. Müller. "STM Spectroscopy of Star-Type Molecular Magnet." Dhaka University Journal of Science 60, no. 1 (April 14, 2012): 87–91. http://dx.doi.org/10.3329/dujs.v60i1.10343.

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In order to achieve a better understanding of how scanning tunneling microscopy (STM) images of metallo-complexes are related to the geometric and electronic structure, we performed scanning microscopy (STM) and scanning tunneling spectroscopy (STS) techniques on [FeIIIFeIII 3L6] (L= N-methylaminediethanolate) star-type tetranuclear molecular magnet. The experiments were performed under ambient condition. We were able to image single molecule by STM with submolecular resolution. In our STS measurements we found a rather large signal at the positions of iron ion centers in the molecules. This direct addressing of metal centers was further confirmed by density functional theory (DFT) calculations.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10343 Dhaka Univ. J. Sci. 60(1): 87-91 2012 (January)
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Hatch, John Byron, Luisa Whittaker-Brooks, Tai-Lung Wu, Gen Long, Hao Zeng, G. Sambandamurthy, Sarbajit Banerjee, and Hong Luo. "Intermediate metallic phase in VO2observed with scanning tunneling spectroscopy." Phys. Chem. Chem. Phys. 16, no. 27 (2014): 14183–88. http://dx.doi.org/10.1039/c4cp01551g.

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BOBBA, F., R. LAMY, D. RODITCHEV, W. SACKS, J. KLEIN, V. FERRANDO, C. FERDEGHINI, F. GIUBILEO, and A. M. CUCOLO. "SCANNING TUNNELING SPECTROCOPY ON MgB2 THIN FILMS." International Journal of Modern Physics B 17, no. 04n06 (March 10, 2003): 446–52. http://dx.doi.org/10.1142/s021797920301608x.

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Low temperature Scanning Tunneling Microscopy/Spectroscopy (STM/STS) was used to study the superconducting properties of as grown MgB2 thin films. Two different Pulsed Laser Ablation deposition procedures were used to fabricate the samples. Depending on growth conditions, STS/STM analysis revealed either superconducting or normal metallic behavior on the sample surfaces. In the first case the tunneling spectra with well-pronounced superconducting gap of 2.6-3.2 meV were observed at T = 4.2 K. STS spectra were found to be position independent, thus showing a very high spatial homogeneity of the films. No evidence of double gap structures was found. Moreover, in contrast with a bulk TC = 35.7K of the samples, the superconductivity with a damped TC was observed on the surface. In the second case, the superconducting features were completely absent in the tunneling spectra. We associate such a behaviour of the samples of second type with the presence of a thick metallic cap layer all over the surface.
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Carroll, D. L., P. M. Ajayan, and S. Curran. "Local Electronic Structure in Ordered Aggregates of Carbon Nanotubes: Scanning Tunneling Microscopy/scanning Tunneling Spectroscopy Study." Journal of Materials Research 13, no. 9 (September 1998): 2389–95. http://dx.doi.org/10.1557/jmr.1998.0332.

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The recent application of tunneling probes in electronic structure studies of carbon nanotubes has proven both powerful and challenging. Using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS), local electronic properties in ordered aggregates of carbon nanotubes (multiwalled nanotubes and ropes of single walled nanotubes) have been probed. In this report, we present evidence for interlayer (concentric tube) interactions in multiwalled tubes and tube-tube interactions in singlewalled nanotube ropes. The spatially resolved, local electronic structure, as determined by the local density of electronic states, is shown to clearly reflect tube-tube interactions in both of these aggregate forms.
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Saad, Mahmoud M., Tamer Abdallah, Khalid Easawi, Sohair Negm, and Hassan Talaat. "Interfacial scanning tunneling spectroscopy (STS) of chalcogenide/metal hybrid nanostructure." Applied Surface Science 337 (May 2015): 1–5. http://dx.doi.org/10.1016/j.apsusc.2015.01.152.

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WINIARZ, SZYMON, PIOTR BISKUPSKI, STANISLAW SZUBA, SLAWOMIR MIELCAREK, and RYSZARD CZAJKA. "STS INVESTIGATIONS OF METALLIC NANOSTRUCTURES DEPOSITED ON Bi2Te3." Surface Review and Letters 14, no. 03 (June 2007): 357–60. http://dx.doi.org/10.1142/s0218625x07009657.

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Bi 2 Te 3 has attracted attention due to its potential applications in the microfabrication of integrated thermoelectric devices. It is also interesting to study the metallization process of this compound. Metallic nanostructures were deposited by means of an electron gun evaporator in ultra high vacuum (UHV) conditions (10-8 Pa) on the freshly cleaved 0001 surface of the crystal Bi 2 Te 3. Measurements were conducted using the commercially available Omicron UHV scanning tunneling microscope (STM). Scanning tunneling spectroscopy (STS) measurements were performed using current imaging tunneling spectroscopy (CITS), and subsequent calculation of the dI/dV maps. Metallic characteristics were observed on nickel islands since early stages of the growth. CITS and dI/dV maps showed distinct contrast between the substrate and metallic islands. Similar contrast was not observed in the case of titanium, most probably due to an intercalation process. Occurring of such a process was confirmed by the appearance of the superlattice structure.
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Chang, Sung Sik, and Akira Sakai. "Scanning Tunneling Microscopy Studies of Porous and Oxidized Zn." Key Engineering Materials 326-328 (December 2006): 373–76. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.373.

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This paper reports the scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) studies of porous Zn (p- Zn) prepared by electrochemical etching. Further, the post annealing of the p- Zn is carried out and STM/STS investigations are also performed. STM studies of these samples reveal the porous structure and display small, pseudo-spherical shaped crystals in the range of 2 and 100 nm, 2 and 50 nm, and similar average corrugation of 9 nm for p- Zn and oxidized p-Zn. STS analysis of freshly prepared p- Zn shows a band gap of 2.4 eV along with metallic conductance behavior. However, oxidized p- Zn reveals a distinct wide band gap (3 eV) and shows shallow donor states near the conduction band.
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Ting, Wu, R. Itti, Y. Ishimaru, G. Gu, Y. Enomoto, N. Koshizuka, and S. Tanaka. "Scanning tunneling microscope/scanning tunneling spectroscopy investigation of the structural modulation on the surface of cleaved Bi2Sr2CaCu2Oy, single crystal." Journal of Materials Research 10, no. 4 (April 1995): 817–22. http://dx.doi.org/10.1557/jmr.1995.0817.

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The surface of cleaved Bi2Sr2 CaCu2O3 (Bi2212) single crystals has been studied by means of scanning tunneling microscope (STM) and scanning tunneling spectroscopy (STS) at room temperature in ultrahigh vacuum. We obtain atomic images of the BiO surface using logarithmic current mode and conventional mode. It is demonstrated that the Bi atoms in the BiO plane are not missing. Some Bi atoms are depressed down below the BiO surface. STS obtained at different places of the surface shows more or less the same feature, indicating that local electronic density of states does not change much due to the depression or the well-known structural modulation. The possible origins of the variation in the period of the structural modulation in the BiO plane of cleaved Bi2212 single crystals extracted from STM images are also studied.
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Dissertations / Theses on the topic "STS [Scanning tunneling spectroscopy]"

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Shao, Jianfei. "STM/STS and BEES Study of Nanocrystals." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10526.

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This work investigates the electronic properties of very small gold and semiconductor particles using Scanning Tunneling Microscopy/Spectroscopy (STM/STS) and Ballistic Electron Emission Spectroscopy (BEES). Complementary theoretical works were also performed. The first theoretical work was to calculate the quantized states in the CdS/HgS/CdS quantum-well-quantum-dot nanocrystals. An eight-band envelope function method was applied to this system. This method treats exactly the coupling between the conduction bands, the light-hole bands, the heavy-hole bands, and the spin-orbit split bands. The contributions of all other bands were taken into account using second order perturbation theory. Gold nanocrystals with diameters of 1.5 nm have discrete energy levels with energy spacings of about 0.2 eV. These values are comparable to the single electron charging energy, which was about 0.5 eV in our experimental configuration. Since bulk gold doesnt have an energy gap, we expect the electron levels both below and above the Fermi level should be involved in the tunneling. Measured spectroscopy data have rich features. In order to understand and relate these features to the electronic properties of the nanocrystals, we developed a tunneling model. This model includes the effect of excited states that have electron-hole pairs. The relaxation between discrete electron energy levels can also be included in this model. We also considered how the nanocrystals affect the BEES current. In this work an ultra-high vacuum and low-temperature STM was re-designed and rebuilt. The BEEM/BEES capabilities were incorporated into the STM. We used this STM to image gold nanocrystals and semiconductor nanocrystals. STS and BEES spectra of gold nanocrystals were collected and compared with calculations.
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Lin, Hong. "Etude couplée par TEM/EELS et STM/STS des propriétés structurales et électroniques des nanotubes C et CNx." Paris 6, 2009. http://www.theses.fr/2009PA066494.

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Ce travail de thèse est dédié à l’étude couplée par TEM/EELS et STM/STS des propriétés structurales et électroniques des nanotubes de carbone purs et des nanotubes dopés à l’azote. Nous mettons d’abord en évidence le rôle des effets à N corps sur les spectres électroniques des tubes mesurés par STS et l’influence du substrat métallique. Ensuite nous présentons une étude systématique des fonctions d’ondes électroniques dans les tubes associées aux singularités de Van-Hove. Nous avons mis en évidence la brisure de symétrie de ces états qui est bien décrite par un modèle de liaisons fortes et qui a été confirmée par des calculs ab-initio. La dernière partie concerne l’étude de nanotubes dopés par des atomes d’azote. Des mesures de EELS montrent la présence d’azote dans les tubes et permet d’identifier des liaisons de type pyridinique. Les mesures STM font apparaître plusieurs défauts. Au final nous proposons que les atomes d’azote soient généralement accompagnés de défauts structuraux.
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Verlhac, Benjamin. "Atomic-scale spin-sensing with a single molecule at the apex of a scanning tunneling microscope." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAE007/document.

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L’étude présentée dans ce manuscrit s’inscrit dans le domaine du magnétisme de surface, qui a connu de grands développements ces dernières années grâce au microscope à effet tunnel (STM). Elle a pour but de montrer qu’une molécule simple, le nickelocène [Ni(C5H5)2], peut être attachée au sommet d’une pointe STM afin de produire une pointe-sonde magnétique, qui, dans le cadre de l’imagerie magnétique, présente des avantages indéniables comparés à des pointes conventionnelles. À la différence d’autres systèmes moléculaires étudiés avec le STM, nous montrons que les propriétés magnétiques du nickelocène en phase gazeuse sont préservées en présence d’un métal, même lorsque la molécule est attachée au sommet d’une pointe STM. Nous présentons trois résultats marquants avec cette pointe-sonde moléculaire: 1) Nous montrons que l’on peut contrôler le spin du nickelocène, activant à souhait un effet Kondo ; 2) Nous produisons à l’aide du courant tunnel des excitations entre les états de spin du nickelocène, que nous pouvons aisément identifier au travers de la conductance moléculaire. Ces états sont sensibles à toute perturbation magnétique extérieure au nickelocène; 3) Au travers de ces excitations, nous sondons alors le magnétisme de surface. Nous montrons qu’en couplant magnétiquement la pointe-sonde moléculaire avec des atomes, soit isolés soit dans une surface ferromagnétique, nous pouvons mesurer leur polarisation de spin, ainsi que le couplage d’échange nickelocène-atome. Ce dernier permet d’obtenir un contraste magnétique en imagerie STM à l’échelle atomique
The study presented in this manuscript is part of the field of surface magnetism, which has undergone major developments in recent years thanks to the scanning tunneling microscope (STM). It aims to show that a single molecule, nickelocene [Ni(C5H5)2], can be attached to the tip of a STM to produce a magnetic probe-tip, which, in the context of magnetic imaging, has undeniable advantages compared to conventional tips. Unlike other molecular systems studied with STM, we show that the magnetic properties of nickelocene in the gas phase are preserved in the presence of a metal, even when the molecule is attached to the tip of a STM. We present three remarkable results with this molecular probe-tip: 1) We show that we can control the spin of nickelocene, activating at will a Kondo effect; 2) We monitor the spin states of nickelocene by producing electrically-driven excitations, which we can easily identify through the molecular conductance. These states are sensitive to the magnetic environment surrounding nickelocene; 3) We use these states to probe surface magnetism. We show that by magnetically coupling the molecular probe tip with single atoms, either isolated or in a ferromagnetic surface, we can measure their spin polarization, as well as the nickelocene-atom exchange coupling. By monitoring this coupling it is possible to obtain a magnetic contrast in the STM images with atomic-scale resolution
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Kubista, Kevin Dean. "Local measurements of cyclotron states in graphene." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39592.

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Multilayer epitaxial graphene has been shown to contain "massless Dirac fermions" and is believed to provide a possible route to industrial-scale graphene electronics. We used scanning tunneling microscopy (STM) and spectroscopy (STS) in high magnetic fields to obtain local information on these fermions. A new STS technique was developed to directly measure graphene's energy-momentum relationship and resulted in the highest precision measurement of graphene's Dirac cone. STS spectra similar to ideal graphene were observed, but additional anomalies were also found. Extra peaks and an asymmetry between electron and hole states were shown to be caused by the work function difference between the Iridium STM tip and graphene. This tip effect was extracted using modeled potentials and performing a least square fit using degenerate perturbation theory on graphene's eigenstates solved in the symmetric gauge. Defects on graphene were then investigated and magnetic field effects were shown to be due to a mixture of potential effect from defects and the tip potential. New defect states were observed to localize around specific defects, and are believed to interact with the STM tip by Stark shifting in energy. This Stark shift gives a direct measurement of the capacitive coupling between the tip and graphene and agrees with the modeled results found when extracting the tip potential.
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Wang, Bo. "An atomistic approach to graphene and carbon clusters grown on a transition metal surface." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2069.

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In this thesis, graphene (i.e. monolayer carbon film) and carbon clusters supported on a transition metal surface are systematically studied by local probe techniques, with respect to their structures, electronic properties and formation mechanisms. The main tools used are low-temperature scanning tunnelling microscopy and spectroscopy (STM and STS), which are introduced in Chapter 2. The mechanism of the resonance tunnelling at electron energies higher than the work function of the surface is discussed in detail, and a qualitative explanation of the Gundlach oscillations in the corresponding spectroscopy is presented. Epitaxial graphene synthesised on the Rh(111) surface by ethylene dehydrogenation is investigated by STM in Chapter 4. Such carbon film exhibits a hexagonal Moiré pattern due to a lattice mismatch between graphene and the rhodium substrate. The periodicity and local registries of the graphene/Rh(111) superstructure are carefully analysed. Based on a thorough discussion about the “commensurate vs. incommensurate” nature of the Moiré pattern in surface science field, the graphene/Rh(111) system is identified to have a non-simple-commensurate superstructure. The surface electronic properties and geometric buckling of graphene/Rh(111) are investigated by resonance tunnelling spectroscopy (RTS) and density functional theory (DFT) calculations in Chapter 5. Spectroscopy measurements reveal a modulation of the electronic surface potential (or work function Φ) across the supercell of epitaxial graphene. Based on the microscopy/spectroscopy data and the extended DFT calculations, we examined the electronic coupling of the various local C-Rh registries, and identified both experimentally and theoretically the local atomic configurations of maximum and minimum chemical bonding between graphene and the rhodium substrate. We studied in Chapter 6 the growth mechanism of graphene on Rh(111) at elevated temperatures. This part starts by investigating the dehydrogenation of ethylene into ethylidyne. When the dehydrogenation process is complete, monodispersed carbon species, identified as 7C6, are found to dominate the cluster population on the rhodium terraces. A significant coalescence of the 7C6 clusters into graphene islands occurs at temperatures higher than 873 K. The structural and electronic properties of the 7C6 carbon clusters are examined by high-resolution STM and STS, and compared with coronene molecules, i.e. the hydrogenated analogues of 7C6. DFT calculations are further used to explain the stability of 7C6 supported on the Rh(111) surface, and also the structural characteristics of such magic-sized carbon clusters.
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Cahlík, Aleš. "Spektrální analýza a charakterizace magnetických atomů a studium supravodivých vrstev pomocí nízkoteplotní STM." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254337.

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This work is divided in two thematic parts. The first part shows a refurbishment of a Omicron low temperature STM set-up and its utilization for preparation of superconducting-magnetic interfaces. First, a cleaning procedure of suitable metallic substrates, specifically W(110) and Ir(111), is shown. It is followed by results of iron monolayer deposition on Ir(111) (Fe-Ir(111) interface). The last section deals with study of vanadium growth on pure Ir(111) substrate as well as on mentioned Fe-Ir(111) interface. The second thematic part deals with magnetism of cobalt atoms on a monolayer metal dichalcogenide WS2. It focuses primarily on studying their magnetic moment and magnetic anisotropy using X-ray magnetic circular dichroism (XMCD).
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Vasseur, Guillaume. "Étude par ARPES et STS des propriétés éléctroniques de réseaux métalliques et organiques nanostructurés." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0151/document.

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Dans ce travail nous démontrons, au travers de deux études, l'intérêt fondamental du couplage des techniques de photoémission résolue en angle (ARPES) et de spectroscopie tunnel (STS) dans l'analyse des propriétés électroniques d'interfaces nanostructurées. Dans la première partie, nous présentons une méthodologie permettant de déduire le potentiel de surface induit par la reconstruction triangulaire d'une monocouche d'Ag/Cu(111). Cette méthode est basée sur la mesure des gaps caractérisant la structure de bande de l'état de Shockley du système aux points de haute symétrie de la zone de Brillouin. L'évaporation d'adatomes de potassium permet d'augmenter le nombre de gaps accessibles en photoémission en décalant les bandes vers les états occupés. Dans un modèle d'électrons presque libres, leur amplitude nous donne accès aux premières composantes de Fourier du potentiel. La reconstruction de ce dernier dans l'espace direct nous permet ensuite de calculer la densité d'états locale que nous comparons aux mesures de conductance STS. La seconde partie est consacrée à l'étude de la croissance et des propriétés électroniques des molécules de 1,4-dibromobenzène (DBB) et 1,4-diiodobenzène (DIB) évaporées sur Cu(110). Leur dépôt à température ambiante sur la surface entraîne la déshalogénation des molécules et la formation de phases organométalliques. A 200°C, le système polymérise pour former des chaînes unidimensionnelles de poly(p-phénylène) parfaitement alignées. Les mesures ARPES révèlent l'existence d'une bande pi unidimensionnelle d'états HOMOs dispersant sous le niveau de Fermi. En STS, nous observons également, pour des petites chaînes, le confinement des états LUMOs dans la partie inoccupée du spectre. Le déconfinement de ces états pour les grandes chaînes conduit à la formation d'une bande continue croisant le niveau de Fermi, conférant au polymère un caractère métallique 1D. Le gap HOMO-LUMO est alors mesuré à 1.15 eV
In this work, through two different studies, we demonstrate the fundamental interest in the coupling of angle resolved photoemission (ARPES) and scanning tunneling spectroscopy (STS) to investigate the electronic properties of nanostructured interfaces. In the first part we present a methodology to determine the surface potential of the triangular reconstructed one monolayer of Ag/Cu(111) interface from ARPES. This method is based on the measurement of the Shockley state band structure’s gaps at the high symmetry points of the Brillouin zone. Deposition of potassium adatoms allows us to shift the surface state towards higher binding energies in order to increase the number of accessible gaps in photoemission. From the magnitude of these gaps we deduce the two first Fourier components of the potential felt by electrons using the nearly free electron model. Then we reconstruct it and calculate the local density of states in order to compare it with the conductance maps probed by STS. In the second part we report the study of the growth and the electronic properties of the two molecules 1,4-dibromobenzene (DBB) and 1,4-diiodobenzene (DIB) evaporated on Cu(110). For room temperature deposition, we first observe their deshalogenation and the formation of an intermediate organometallic phase. Then, above 200°C, the system polymerizes into a long-range ordered array of one dimensional poly(p-phenylene) polymer. ARPES intensity maps allowed us to identify a one dimensional graphene-like strongly dispersive pi-band below the Fermi energy. By STS we also observed LUMOs confined states for small chains over the Fermi level. The loss of confinement for long chains induces the formation of a continuous dispersive band which crosses the Fermi energy, conferring a 1D metallic character to the polymer. The HOMO-LUMO gap is found to be 1.15 eV
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Xing, Sarah. "Étude par ARPES et STS des propriétés électroniques d’un supraconducteur haute Tc à base de fer et de chaînes de polymères élaborées à la surface de métaux nobles." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0349/document.

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Dans ce travail, nous illustrons l’avantage de coupler les techniques de photoémission résolue en angle (ARPES) et de microscopie/spectroscopie tunnel (STM/STS) pour l'étude des propriétés électroniques et structurales des surfaces/interfaces nanostructurées. Dans la première partie, nous présentons l’étude du supraconducteur non conventionnel Eu(Fe0.86Ir0.14)2As2. Ce composé, dopé en Ir de manière optimale, possède une phase supraconductrice réentrante (Tc=22K) qui coexiste avec un ordre ferromagnétique (TM=18K). Nous présentons une étude par ARPES de la structure de bande dans le plan et hors plan ainsi que de la surface de Fermi. Les bandes associées aux états 3d du fer, responsables de la supraconductivité, sont modifiées en présence de la substitution en Ir, mais la topologie de la surface de Fermi est conservée. Le gap supraconducteur est mesuré à 5.5 meV, supérieur à la valeur estimée par la théorie BCS pour une température Tc=22K. La disparition du gap au-dessus de T=10K coïncide avec la phase résistive induite par l’ordre magnétique des moments Eu2+. Les modifications de la surface de Fermi dans le composé substitué indiquent clairement un dopage effectif en trou par rapport au composé parent. La seconde partie est consacrée à l’étude de la croissance, des mécanismes de polymérisation et des conséquences sur les propriétés électroniques de nanostructures moléculaires. Celles-ci sont élaborées par évaporation sous vide des molécules 1,4-dibromobenzène (dBB) et 1,4-diiodobenzène (dIB) sur les surfaces de Cu(110), Cu(111) et Cu(775) en utilisant la réaction catalytique de Ullmann. Nous avons étudié l’influence du type d’halogène et de substrat sur la réaction de polymérisation ainsi que les conséquences sur les propriétés électroniques. En particulier, nous mettons en évidence par des mesures STM et NEXAFS (mesures effectuées à l’aide du rayonnement synchrotron) un mécanisme original de croissance des polymères sur la surface de Cu(775) qui s’accompagne d’une restructuration à l’échelle nanométrique sous la forme d’un « step-bunching ». Celui-ci conduit à la formation de polymères de grande longueur et parfaitement ordonnés à grande échelle. En combinant les mesures ARPES et STS, nous mettons en évidence une évolution du gap HOMO-LUMO caractérisant les chaînes de poly(para)phénylène ainsi formées avec le type d’halogène impliqué dans la réaction catalytique et la géométrie du substrat. Nous montrons ainsi que si le caractère métallique du polymère élaboré sur le Cu(110) trouve son origine dans sa forte interaction avec le substrat, celle-ci diminue fortement lorsque la synthèse a lieu sur les surfaces de Cu(111) et de Cu(775) conduisant à retrouver un comportement semi-conducteur caractérisé par un gap HOMO-LUMO évalué à 2.2 eV
In this work, we highlight the advantage of coupling techniques such as angle resolved photoemission (ARPES), scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) for investigating the electronic and structural properties of nanostructured surfaces/interfaces. In the first part, the electronic structure of the reentrant superconductor Eu(Fe0.86Ir0.14)2As2 (Tc=22K) with coexisting ferromagnetic order (TM=18K) is investigated using angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy (STS). We study the in-plane and out-of-plane band dispersions and Fermi surface of Eu(Fe0.86Ir0.14)2As2. The near EF Fe 3d-derived band dispersions near the high-symmetry points show changes due to Ir substitution, but the Fermi surface topology is preserved. The superconducting gap measured at the lowest temperature T=5K (equal to 5.5meV) is beyond the weak-coupling BCS estimation for Tc=22 K. The gap gets closed at a temperature T=10K and this is attributed to the resistive phase which sets in at TM=18K due to the Eu2+ derived magnetic order. The modifications of the FS with Ir substitution clearly indicate an effective hole doping with respect to the parent compound. In the second part, we provide insight into the growth and the electronic properties of 1,4-dibromobenzene (dBB) and 1,4-diiodobenzene on Cu(110), Cu(111) and Cu(775) surfaces. The influence of the substrate is reported in this study: using a copper vicinal surface as support for on-surface Ullmann coupling leads to highly ordered, quasi-infinite polymer growth. Such a new growth mechanism, stemming from vicinal surface reconstructions is observed. The structural composition of different phases obtained in the study is discussed as a concomitant effect of the halogen and the surface geometry. Various interactions such as substrate/molecule, substrate/halogen, molecule/halogen as well as molecule/molecule interactions that took place into the polymerization mechanism are considered for analyzing the electronic properties of the different interfaces. We measured an 1.15 eV HOMO-LUMO gap in dBB/Cu(110), whereas the gap is found to be slightly higher than 1.5eV in dBB/Cu(111) and equal to 2.2eV in dBB/Cu(775). Such a metal-semiconductor transition is shown to occur when the halogen is switched (Br vs I) or the surface geometry is changed (Cu(110) vs Cu(775)) in agreement with the concomitant reduction of the polymer/substrate interaction
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Eilers, Stefan. "Strukturelle und elektronische Eigenschaften von Nanographen-Graphen-Systemen sowie Schnitt- und Faltverhalten von Graphen." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16715.

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Im ersten Teil der Arbeit werden Graphen sowie von Monolagen von auf Nanometer großen Graphenen basierenden Hexa-peri(Dodekyl)-Hexabenzocoronen-Molekülen (HBC-C12), adsorbiert auf Graphen, mit Rastertunnelmikroskopie und –spektroskopie an der Fest-Flüssig-Grenzfläche untersucht. Nanographen-Moleküle selbstaggregieren epitaktisch zu hochgeordneten Monolagen. Die Einheitszellen der Moleküllagen auf Monolage Graphen, Bilage Graphen und auf Graphit sind ununterscheidbar. Die Strukturen der Moleküllagen auf gewellten und flachen Teilen des Graphens stimmen überein. Strom-Spannungs-Kennlinien an Nanographen auf Graphen und auf Graphit weisen auf sehr ähnliche elektronische Eigenschaften hin. Zusammengefasst sind strukturelle sowie elektronische Eigenschaften der Nanographenlage homogen, stabil und definiert. Graphen erweist sich als bestens als Substrat und gleichzeitig als Elektrode für hochgeordnete Lagen von Nanographen-Molekülen geeignet. Im zweiten Teil der Arbeit wird Graphen mit der Sonde eines Rasterkraftmikroskops im Kontaktmodus mechanisch manipuliert. Es wird gezeigt, dass Graphen in nur einem Manipulationsschritt zu Streifen und Spalt geschnitten werden kann. Dieses Verhalten wird mit einem klassischen Modell des Biegens theoretisch erklärt. Das Schnittverhalten liegt in der 2-Dimensionalität des Graphens sowie in dessen Faltbarkeit auf Grund hinreichender Elastizität begründet. Durch mechanische Manipulation mit der Sonde des Rasterkraftmikroskops im Kontaktmodus unter atmosphärischen Bedingungen wird eine Flüssigkeitsschicht zwischen Graphen und dem Siliziumdioxidsubstrat nachgewiesen, welche eine mögliche Erklärung des stark kraftabhängigen Materialkontrasts zwischen Graphen und Siliziumdioxid im Amplitudenmodulationsmodus des Rasterkraftmikroskops darstellt. Weiter wird gezeigt, dass das Falten des Graphens durch mechanische Manipulation eine geeignete Methode zur Herstellung nicht epitaktisch aufeinander gestapelter Graphene darstellt.
In the first part of the thesis graphene as well as monolayers of hexa-peri(dodecyl)-hexabenzocoronene molecules (HBC-C12) based on nanometer sized graphenes adsorbed on graphene is investigated by scanning tunnelling microscopy and tunneling spectroscopy at the solid-liquid interface. The nanographene molecules self-assemble on graphene epitaxially to form highly ordered monolayers. The unit cells of the molecular layers on monolayer graphene, bilayer graphene and on graphite appear identical. The structures of the molecular layers occur equal on corrugated and on flat parts of graphene. Current-voltage-characteristics show that the electronic properties of nanographene on graphene and on graphite are very similar. Summarized, structural as well as electronic properties of the nanographene layer are homogeneous, stable and defined. Graphene proves to be excellently qualified for simultaneously being substrate as well as electrode for highly ordered layers of nanographene based molecules. In the second part of the thesis graphene is mechanically manipulated in air in contact mode of a scanning force microscope. It is shown that a single manipulation process can lead to a stripe cut out of graphene. This behaviour is theoretically explained by a classical bending model. The cutting behavior originates from the 2-dimensionality of graphene and its folding ability because of sufficient elasticity. A liquid layer between graphene and the silicon dioxide substrate is verified by mechanical manipulation in contact mode of a scanning force microscope. Hence a possible explanation could be found for the strongly force dependent material contrast between graphene and silicon dioxide in amplitude modulation mode of the scanning force microscope. Further, it is demonstrated that folding graphene by mechanical manipulation is a proper method for the production of graphene stacked on each other non-epitaxially.
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Kramar, John Adam Baldeschwieler John D. Baldeschwieler John D. "Scanning tunneling microscopy and spectroscopy of molybdenum disulphide /." Diss., Pasadena, Calif. : California Institute of Technology, 1990. http://resolver.caltech.edu/CaltechETD:etd-06132007-103520.

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Books on the topic "STS [Scanning tunneling spectroscopy]"

1

Prüser, Henning. Scanning Tunneling Spectroscopy of Magnetic Bulk Impurities. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06385-0.

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M, Koenraad P., Kemerink M, and Technische Hogeschool Eindhoven, eds. Scanning tunneling microscopy/spectroscopy and related techniques: 12th international conference, Eindhoven, the Netherlands. Melville, NY: American Institute of Physics, 2003.

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International, Conference on Scanning Tunneling Microscopy/Spectroscopy and Related Techniques (12th 2003 Eindhoven Netherlands). Scanning tunneling microscopy/spectroscopy and related techniques: 12th International Conference STM'03, Eindhoven, The Netherlands, 21-25 July 2003. Melville, N.Y: American Institute of Physics, 2003.

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International Conference on Scanning Tunneling Microscopy/Spectroscopy (4th 1989 Ōarai-machi, Japan). Proceedings of the Fourth International Conference on Scanning Tunneling Microscopy/Spectroscopy: 9-14 July 1989, Oarai Culture Center, Oarai, Ibaraki, Japan. Edited by Ichinokawa Takeo 1926-, Ōyō Butsuri Gakkai, and American Vacuum Society. New York: Published for the American Vacuum Society by the American Institute of Physics, 1990.

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Buchner, Florian. STM investigation of molecular architectures of porphyrinoids on a Ag(111) surface: Supramolecular ordering, electronic properties and reactivity. Berlin: Springer Verlag, 2010.

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International Conference on Scanning Tunneling Microscopy/Spectroscopy (5th 1990 Baltimore, Md.). Proceedings of the Fifth International Conference on Scanning Tunneling Microscopy/Spectroscopy and the First International Conference on Nanometer Scale Science and Technology, 23-27 July 1990, Hyatt Regency, Baltimore, Maryland, USA. Edited by Colton Richard J, Marrian Christie R. K, Stroscio Joseph Anthony 1956-, American Vacuum Society, and International Conference on Nanometer Scale Science and Technology (1st : 1990 : Baltimore, Md.). New York: Published for the American Vacuum Society by the American Institute of Physics, 1991.

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Czajka, Ryszard. Zastosowanie skaningowej mikroskopii i spektroskopii tunelowej do badania własności fizycznych układów mezoskopowych. Poznań: Wydawn. Politechniki Poznańskiej, 1997.

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International Conference on Scanning Tunneling Microscopy (8th 1995 Snowmass Village, Colo.). Papers from the eighth InternationalConference on Scanning Tunneling Microscopy/Spectroscopy and Related Techniques, 23-28 July 1995, Snowmass Village, Colorado. Edited by Hamers Robert. New York: American Institute of Physics for the American Vacuum Society, 1996.

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Yang, Jinlong, and Qunxiang Li. Theoretical simulations of scanning tunnelling microscope images and spectra of nanostructures. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.15.

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This article presents theoretical simulations of scanning tunnelling microscope (STM) images and spectra of nanostructures. It begins with an overview of the theories of STM and scanning tunnelling spectroscopy (STS), focusing on four main approaches: the perturbation or Bardeen approach, the Tersoff–Hamann approach and its extension, the scattering theory or Landauer–Bütticker approach, and the non-equilibrium Green's function or Keldysh approach. It then considers conventional STM and STS experimental investigations of various systems including clean surfaces, ad-atoms, single molecules, self-assembled monolayers, and nanostructures. It also discusses STM activities that go beyond conventional STM images and STS, such as functionalized STM tip, inelastic spectroscopy identification, manipulation, molecular electronics and molecular machines.
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Cuevas, J. C., D. Roditchev, T. Cren, and C. Brun. Proximity Effect A New Insight from In Situ Fabricated Hybrid Nanostructures. Edited by A. V. Narlikar. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198738169.013.4.

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This article investigates the proximity effect on small length and energy scales in novel low-dimensional systems using in situ fabricated superconducting nanostructures (SNSs) and scanning tunneling microscopy/spectroscopy (STM/STS) techniques. After a brief historical review of research on superconductivity and the proximity effect, the article describes how to build a variety of in situ superconducting hybrid nanostructures and how to investigate the proximity density of states with the help of STM/STS. It then considers the proximity effect in a correlated 2D disordered metal and in diffusive SNS junctions before discussing proximity Josephson vortices. It also examines the proximity effect between two dissimilar superconductors and concludes by highlighting several fundamental problems related to proximity effect in the framework of quasiclassical microscopic Usadel theory.
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Book chapters on the topic "STS [Scanning tunneling spectroscopy]"

1

Voigtländer, Bert. "Scanning Tunneling Spectroscopy (STS)." In Scanning Probe Microscopy, 309–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45240-0_21.

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Neddermeyer, H., and M. Hanbücken. "Scanning Tunneling Microscopy (STM) and Spectroscopy (STS), Atomic Force Microscopy (AFM)." In High-Resolution Imaging and Spectrometry of Materials, 321–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-07766-5_7.

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de Parga, Amadeo L. Vázquez, and Rodolfo Miranda. "Scanning Tunneling Spectroscopy." In Encyclopedia of Nanotechnology, 1–11. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6178-0_111-2.

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Morgenstern, Markus. "Scanning Tunneling Spectroscopy." In CFN Lectures on Functional Nanostructures - Volume 2, 87–102. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14376-2_5.

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Sagisaka, Keisuke. "Scanning Tunneling Spectroscopy." In Compendium of Surface and Interface Analysis, 605–10. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6156-1_98.

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Zhu, Yimei, Hiromi Inada, Achim Hartschuh, Li Shi, Ada Della Pia, Giovanni Costantini, Amadeo L. Vázquez de Parga, et al. "Scanning Tunneling Spectroscopy." In Encyclopedia of Nanotechnology, 2313–21. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_111.

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Vázquez de Parga, Amadeo L., and Rodolfo Miranda. "Scanning Tunneling Spectroscopy." In Encyclopedia of Nanotechnology, 3544–53. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-9780-1_111.

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Binnig, G., K. H. Frank, H. Fuchs, N. Garcia, B. Reihl, H. Rohrer, F. Salvan, and A. R. Williams. "Tunneling Spectroscopy and Inverse Photoemission: Image and Field States." In Scanning Tunneling Microscopy, 93–96. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-011-1812-5_11.

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Bode, M., and R. Wiesendanger. "Spin-Polarized Scanning Tunneling Spectroscopy." In Magnetic Microscopy of Nanostructures, 203–23. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-26641-0_10.

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García, Nicolás. "Scanning Tunneling Microscopy and Spectroscopy." In Surface and Interface Characterization by Electron Optical Methods, 235–66. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-9537-3_13.

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Conference papers on the topic "STS [Scanning tunneling spectroscopy]"

1

Okuyama, D. "A Study of Polycrystalline W Surface with STM/STS." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639784.

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Kinoda, G. "STM/STS Observations of Atomic Impurities in High-Tc Superconductor Bi2Sr2CaCu2Oy Single Crystals." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639798.

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Wang, Z. Z. "Inhomogeneity of Tunneling Spectroscopy of Bi2Sr2CaCu2O8+δ." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639799.

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Yamada, T. K. "Data Evaluation for Spin-Polarized Scanning Tunneling Spectroscopy Measurements." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639758.

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Onosov, I. "Selective resonance-tunneling microscopy." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639810.

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Schwarz, Alexander. "Three-Dimensional Force Field Spectroscopy." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639679.

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Bolhuis, T. "Scanning Probe Microscopy Markup Language." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639706.

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Sutter, P. "Energy-Filtered Scanning Tunneling Microscopy using a Semiconductor Tip." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639674.

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Craciun, M. F. "Scanning Tunnelling Microscopy and Spectroscopy on Alkali Doped Copper Phthalocyanine." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639741.

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Shik, A. "A Theoretical Analysis of Scanning Capacitance Microscopy." In SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY AND RELATED TECHNIQUES: 12th International Conference STM'03. AIP, 2003. http://dx.doi.org/10.1063/1.1639807.

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Reports on the topic "STS [Scanning tunneling spectroscopy]"

1

Coleman, R. V. Surface structure and analysis with scanning tunneling microscopy and electron tunneling spectroscopy. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/6017304.

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Coleman, R. V. Surface structure and analysis with scanning tunneling microscopy and electron tunneling spectroscopy. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/5879901.

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Coleman, R. V., Zhenxi Dai, W. W. McNairy, C. G. Slough, and Chen Wang. Surface structure and spectroscopy of charge-density wave materials using scanning tunneling microscopy. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/10122090.

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Coleman, R. V., Zhenxi Dai, W. W. McNairy, C. G. Slough, and Chen Wang. Surface structure and spectroscopy of charge-density wave materials using scanning tunneling microscopy. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5901839.

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Hsu, Julia. Surface structure and analysis with scanning probe microscopy and electron tunneling spectroscopy. Final report. Office of Scientific and Technical Information (OSTI), May 1998. http://dx.doi.org/10.2172/758935.

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Hemminger, John C. Optical Spectroscopy and Scanning Tunneling Microscopy Studies of Molecular Adsorbates and Anisotropic Ultrathin Films. Office of Scientific and Technical Information (OSTI), July 2019. http://dx.doi.org/10.2172/1542895.

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Coleman, R. V. Surface structure and analysis with scanning tunneling microscopy and electron tunneling spectroscopy. Progress report, May 1, 1987--April 30, 1992. Office of Scientific and Technical Information (OSTI), March 1992. http://dx.doi.org/10.2172/10122024.

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Coleman, R. V. Surface structure and analysis with scanning tunneling microscopy and electron tunneling spectroscopy. Progress report, May 1, 1991--April 30, 1992. Office of Scientific and Technical Information (OSTI), March 1992. http://dx.doi.org/10.2172/10122074.

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Davis, Seamus, and Paul L. McEuen. Electronic Wavefunction Imaging and Spectroscopy in Metallic and Magnetic Nanostructures by Millikelvin Scanning Tunneling Microscopy. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada414343.

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Hemminger, J. C. Optical spectroscopy and scanning tunneling microscopy studies of molecular adsorbates and anisotropic ultrathin films. Final report. Office of Scientific and Technical Information (OSTI), September 1998. http://dx.doi.org/10.2172/656637.

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