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Dissertationen zum Thema „Atomic matters“

Autor: Grafiati
Veröffentlicht am 3. Juni 2025
Zuletzt aktualisiert am 31. Juli 2025

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1

Köhl, Michael. "Observing correlated quantum matter with atomic gases." Zürich : ETH, Eidgenössische Technische Hochschule Zürich, Institut für Quanten Elektronik, 2006. http://e-collection.ethbib.ethz.ch/show?type=habil&nr=23.

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2

Gagnon, Morris Alexis. "Nanolithography using an atomic microscope." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80270.

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In this thesis, I study the nanolithography of gallium arsenide samples by local oxidation with an atomic force microscope (AFM). I examine the current theoretical descriptions of the reaction kinetics and compare the results to experimental data. The main goal is to characterize the AFM oxidation process such that high quality features can be routinely patterned. I also investigate the use of alternative oxidation environments in an attempt to improve the height and aspect ratio of the AFM local oxidation features. An alternative lithography technique involving scratching under a high
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3

Sang, Yi 1976. "Thermal and inertial effects on atomic friction." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102165.

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In this thesis we study the thermal and inertia effects on atomic friction. The Friction Force Microscope (FFM) is simulated with the Tomlinson model. We introduce a method to calculate atomic friction including thermal effects. A novel scaling form is proposed and tested. We also investigate the inertial effects of the bulk and the tips. We find if the bulk is weakly damped, there is hysteresis in the velocity versus driving force curve. When the tips are weakly damped, the friction force shows large deviations.<br>In the first half of the thesis, we study the atomic friction between an FFM t
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4

Sun, Yan 1972. "Study of interactions at the atomic scale." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85652.

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A combined ultra-high vacuum scanning tunneling microscope, atomic force microscope, and field ion microscope UHV (STM/AFM/FIM) system was used to study mechanical and electronic interactions at the atomic scale. A surface science system, consisting of an Auger electron spectrometer, UHV evaporators, ion sputter gun and annealing capabilities, was designed and constructed. A new force sensor preparation method was developed suitable for high stability imaging. Using this improved system, we studied W tip- Au(111) sample interactions in the regimes from weak coupling to strong interactio
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5

Govind, Niranjan. "First principles calculations of atomic scale structures." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39910.

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Atomic scale structures are studied using first principles or ab initio simulations. We first review the formalism required for a typical calculation and then proceed to examine a few applications. All the simulations were performed using plane wave based pseudopotential methods and by a direct minimization of the Kohn-Sham total energy functional.<br>Using this method, we have investigated the effect of impurity atoms like boron, sulphur and phosphorous on the adhesive properties of two aluminium minimum slabs. We found that both sulphur and phosphorous (both substitutional impurities) decrea
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6

González, Boquera Claudia. "Neutron-rich matter in atomic nuclei and neutron stars." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/668774.

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The proper understanding of the equation of state (EoS) of highly asymmetric nuclear matter is essential when studying systems such as neutron stars (NSs). Using zero-range Skyrme interactions and finite-range interactions such as Gogny forces, momentum-dependent interactions (MDI) and simple effective interactions (SEI), we analyze the properties of the EoS and the influence they may have on the calculations for NSs. We start by studying the convergence properties of the Taylor series expansion of EoS in powers of the isospin asymmetry. Next, we analyze the accuracy of the results for β-stab
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7

Schirmeisen, André. "Metallic adhesion and tunneling at the atomic scale." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0018/NQ55380.pdf.

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8

Iskrenova-Tchoukova, Eugeniya. "All-order approach to high-precision atomic calculation." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 144 p, 2008. http://proquest.umi.com/pqdweb?did=1601519371&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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9

Belzunces, Bastien. "Atomic-scale study of pesticide interaction with soil mineral matter." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30352/document.

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Les pesticides sont des molécules utilisées en grandes quantités en France et dans le monde entier pour la protection des cultures. Lorsque ces substances sont répandues une grande quantit é rejoint les sols. Dans cette thèse, le devenir de pesticides dans le sol est étudié. Pour cela, trois pesticides ont été sélectionnés : l'atrazine, la métamitrone et le fenhexamide ; et une argile de type montmorillonite a été choisie. Les simulations menées lors de cette thèse emploient le formalisme de la Théorie de la Fonctionnelle de la Densité (DFT). La première partie de cette thèse porte sur l'étude
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10

Barnett, Stephen Mark. "Quantum states of radiation and their interaction with atomic matter." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37627.

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11

Hsu, Bailey. "Inhomogeneity-Induced Spin Current in Atomic and Condensed Matter Systems." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2172.

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I derive and apply quantum propagator techniques to atomic and condensed matter systems. I observe many interesting features by following the evolution of a wavepacket. In atomic systems, I revisit the Stern-Gerlach effect and study the spin dynamics inside an inhomogeneous magnetic field. The results I obtained are not exactly the same as the textbook description of the effect which is usually a manifestation of a perfect space and spin entanglement. This discovery can provide insight on more reliable quantum computation device designs. In condensed matter systems, the doping concentration in
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12

Cai, Yang. "Atomic processes induced by electronic excitation in insulating crystals." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9540.

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We have studied two examples of atomic processes induced by electronic excitation in insulating crystals. One is the bistable defect system in $\rm CdF\sb2{:}M\sp{3+},$ the other is the athermal halogen atom desorption. The bistable (shallow-deep) defect systems associated with trivalent impurities (In, Ga, Y and Sc) in CdF$\sb2$ are examined. The equilibrium lattice relaxation around the defect and the wavefunction of the electron bound to the impurities are determined by minimizing the energy of the defects. The impurity-fluorine interatomic potentials determined using the electron-gas model
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13

Taylor, Jeremy 1974. "Ab-initio modelling of transport in atomic scale devices." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=37848.

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In this thesis, we develop a novel ab-initio technique to study transport in atomic scale devices based on a self-consistent solution of the Kohn-Sham equations for open systems in and out of equilibrium. Starting from the central motivating theorems of density functional theory, we introduce the basis of the ab-initio technique as currently practiced in condensed matter physics. The Kohn-Sham Hamiltonian is solved numerically by employing a Fireball atomic orbital basis set to transform the problem into matrix form. In order to study open systems, a natural screening approximation is introduc
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14

Malawi, Abdulrahman Ali. "Atomic hydrogen associated with high latitude IRAS cirrus clouds." Thesis, University of Manchester, 1989. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664465.

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15

Preiss, Philipp Moritz. "Atomic Bose-Hubbard Systems With Single-Particle Control." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:26718727.

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Experiments with ultracold atoms in optical lattices provide outstanding opportunities to realize exotic quantum states due to a high degree of tunability and control. In this thesis, I present experiments that extend this control from global parameters to the level of individual particles. Using a quantum gas microscope for 87Rb, we have developed a single-site addressing scheme based on digital amplitude holograms. The system self-corrects for aberrations in the imaging setup and creates arbitrary beam profiles. We are thus able to shape optical potentials on the scale of single lattice si
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16

Moore, Michael Glen. "Nonlinear wave mixing between atomic and optical fields." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/289068.

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The interaction between Bose Einstein condensates (BECs) and coherent light fields is treated within the framework of nonlinear wave mixing and studied using techniques developed in the fields of nonlinear and quantum optics. We focus in particular on two situations involving a BEC driven by a strong off-resonant 'pump' laser. First, we consider the case where the laser light is scattered into a single mode of an optical ring cavity. We then consider the case where the light is scattered into the continuum of vacuum modes of the electric field. The first problem is an extension of recent theor
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17

Jen, Hsiang-Hua. "Theory of light-matter interactions in cascade and diamond type atomic ensembles." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37288.

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In this thesis, we investigate the quantum mechanical interaction of light with matter in the form of a gas of ultracold atoms: the atomic ensemble. We present a theoretical analysis of two problems, which involve the interaction of quantized electromagnetic fields (called signal and idler) with the atomic ensemble (i) cascade two-photon emission in an atomic ladder configuration, and (ii) photon frequency conversion in an atomic diamond configuration. The motivation of these studies comes from potential applications in long-distance quantum communication where it is desirable to generate qu
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18

Bartolo, Nicola. "Matter waves in reduced dimensions : dipolar-induced resonances and atomic artificial crystals." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20177/document.

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La réalisation de condensats de Bose-Einstein et de gaz de Fermi dégénérés ont déclenché d'énormes progrès dans les méthodes théoriques ainsi que dans la mise en place de nouvelles techniques expérimentales. Parmi celles-ci, de fascinantes possibilités viennent de l'implémentation de réseaux optiques : potentiels périodiques pour atomes neutres créés à travers l'interférence de rayons laser. Un gaz dégénéré dans un réseau optique peut être forcé dans des pièges fortement anisotropes, jusqu'à réduire la dimensionnalité du système physique. Du point de vue fondamental, le comportement des ondes
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Bartolo, Nicola. "Matter Waves in Reduced Dimensions: Dipolar-Induced Resonances and Atomic Artificial Crystals." Doctoral thesis, Università degli studi di Trento, 2014. https://hdl.handle.net/11572/368201.

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The experimental achievement of Bose-Einstein condensation and Fermi degeneracy with ultracold gases boosted tremendous progresses both in theoretical methods and in the development of new experimental tools. Among them, intriguing possibilities have been opened by the implementation of optical lattices: periodic potentials for neutral atoms created by interfering laser beams. Degenerate gases in optical lattices can be forced in highly anisotropic traps, reducing the effective dimensionality of the system. From a fundamental point of view, the behavior of matter waves in reduced dimensions sh
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20

Bartolo, Nicola. "Matter Waves in Reduced Dimensions: Dipolar-Induced Resonances and Atomic Artificial Crystals." Doctoral thesis, University of Trento, 2014. http://eprints-phd.biblio.unitn.it/1355/1/PhD_Thesis_Final.pdf.

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The experimental achievement of Bose-Einstein condensation and Fermi degeneracy with ultracold gases boosted tremendous progresses both in theoretical methods and in the development of new experimental tools. Among them, intriguing possibilities have been opened by the implementation of optical lattices: periodic potentials for neutral atoms created by interfering laser beams. Degenerate gases in optical lattices can be forced in highly anisotropic traps, reducing the effective dimensionality of the system. From a fundamental point of view, the behavior of matter waves in reduced dimensions sh
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21

Nute, Jonathan. "A quantum integrated light and matter interface." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/41595/.

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A highly integrated device capable of interfacing light and matter on a chip is presented. 1e7 caesium-133 atoms are captured from a hot vapour into a magneto-optical trap held close to a chip-mounted single-mode fibre. Sub-Doppler optical molasses cools the atoms and transfers them into a tightly focused 18W vertical optical dipole trap which intersects a 30um void that has been laser etched through the single-mode fibre. Thus, the optically trapped atoms are tightly confined in the path of fibre-guided photons for maximum overlap. Such a system is capable of writing, reading and storing quan
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22

Dallorto, Stefano [Verfasser], Ivo W. [Akademischer Betreuer] Rangelow, Adam Gutachter] Schwartzberg, and Steffen [Gutachter] [Strehle. "Enabling control of matter at the atomic level: atomic layer deposition and fluorocarbon-based atomic layer etching / Stefano Dallorto ; Gutachter: Adam Schwartzberg, Steffen Strehle ; Betreuer: Ivo W. Rangelow." Ilmenau : TU Ilmenau, 2020. http://nbn-resolving.de/urn:nbn:de:gbv:ilm1-2019000480.

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23

Dallorto, Stefano [Verfasser], Ivo W. [Akademischer Betreuer] Rangelow, Adam [Gutachter] Schwartzberg, and Steffen [Gutachter] Strehle. "Enabling control of matter at the atomic level: atomic layer deposition and fluorocarbon-based atomic layer etching / Stefano Dallorto ; Gutachter: Adam Schwartzberg, Steffen Strehle ; Betreuer: Ivo W. Rangelow." Ilmenau : TU Ilmenau, 2020. http://d-nb.info/120306683X/34.

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24

Huang, Dennis. "Nanoscale Investigations of High-Temperature Superconductivity in a Single Atomic Layer of Iron Selenide." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493535.

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The potential of interface engineering to enhance electronic properties is exemplified in a single atomic layer of FeSe grown on SrTiO$_3$, which exhibits an order-of-magnitude increase in its superconducting transition temperature ($T_c$ up to 110 K) compared to bulk ($T_c$ = 8 K). Since this discovery in 2012, efforts to reproduce, understand, and extend this finding continue to draw both excitement and scrutiny. In this thesis, we report the use of a combined molecular beam epitaxy (MBE) and scanning tunneling microscopy (STM) system to grow and image films of superconducting FeSe/SrTiO$_3$
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25

Gullans, Michael John. "Controlling Atomic, Solid-State and Hybrid Systems for Quantum Information Processing." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11146.

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Quantum information science involves the use of precise control over quantum systems to explore new technologies. However, as quantum systems are scaled up they require an ever deeper understanding of many-body physics to achieve the required degree of control. Current experiments are entering a regime which requires active control of a mesoscopic number of coupled quantum systems or quantum bits (qubits). This thesis describes several approaches to this goal and shows how mesoscopic quantum systems can be controlled and utilized for quantum information tasks.<br>Physics
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Pilon, Michael Joseph. "Inductively coupled plasma atomic emission spectroscopy using charge injection device detection." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185630.

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A unique echelle spectrometer system employing charge injection device (CID) array detectors for use in inductively coupled plasma atomic emission spectroscopy (ICP-AES) is described. The echelle spectrometer described offers numerous advantages over previous systems including improved light throughput and extended wavelength coverage including the vacuum-ultraviolet (VUV) down to 165 nm. Several improvements in CID array detector technology are also described. Low exposure level linearity is improved and full well capacity is increased by fabricating the CIDs with <100> silicon as opposed to
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27

Distante, Emanuele. "A quantum light-matter interface with Rydberg polaritons in a cold atomic ensemble." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/405892.

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Nonlinear optics at the single-photon level enables deterministic photonphoton interaction, a long-standing goal in quantum photonics science. Besides its implication in fundamental aspects of physics, this would unlock several applications in quantum information science. A relevant example are deterministic Bell state measurements, which find a prominent application in long-distance quantum communications using quantum repeater architecture. Toward this goal, we built a highly nonlinear system based on Rydberg excited states of a cold atomic ensemble and electromagnetically induced transparen
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28

Vernaz-Gris, Pierre. "Preparation of large cold atomic ensembles and applications in efficient light-matter interfacing." Phd thesis, Sorbonne université, 2018. http://hdl.handle.net/1885/157347.

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This cotutelle PhD thesis revolves around quantum optics experiments which involve large atomic ensembles. The study of light-matter interaction and its enhancement are crucial steps in the development and progress of quantum information generation, storage and processing protocols. The work presented here focuses on the evolution of large atomic ensemble preparation techniques, on the development and experimental investigation of stopped and stationary light protocols. Laser-cooled atomic ensembles in both experimental realisations have been brough
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Vernaz-Gris, Pierre. "Preparation of large cold atomic ensembles and applications in efficient light-matter interfacing." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS060/document.

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Cette thèse de doctorat en co-tutelle a été centrée sur des expériences d’optique quantique faisant intervenir de grands ensembles atomiques. L’étude de l’interaction entre la lumière et la matière et l’augmentation de leur couplage dans ces systèmes sont des étapes fondamentales pour le développement et l’amélioration de protocoles de génération, de stockage et de manipulation d’information quantique. Le travail de thèse exposé ici traite en particulier de l’évolution des techniques de préparation d’ensembles atomiques denses, des protocoles de lumière arrêtée et de lumière stationnaire dével
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30

Jaramillo, Avila Benjamin Raziel. "Functional renormalisation group and nuclear matter." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/functional-renormalisation-group-and-nuclear-matter(eefc41b3-cc1b-4ed6-acf6-4008c44e93c1).html.

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This thesis deals with systems of interacting particles with very low energy in the limit where the particle-particle scattering is much larger than the range of the interactions. We use a quantum-field-theory approach which allows us to study both few-body and dense-matter systems in a unified framework. This allows to introduce composite fields of two and three particles (when appropriate). The quantum corrections are calculated nonperturbatively with the Functional RenormalisationGroup. We deal with three types of systems. First we study systems with three and four scalar particles. For thr
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31

Lan, Shau-Yu. "Matter-light entanglement with cold." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28197.

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Thesis (M. S.)--Physics, Georgia Institute of Technology, 2009.<br>Committee Chair: Kuzmich, Alex; Committee Member: Chapman, Michael; Committee Member: Citrin, David; Committee Member: Kennedy, T. A. Brian; Committee Member: Raman, Chandra
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Stomp, Romain-Pierre. "Dissipative and electrostatic force spectroscopy of InAs quantum dots by non-contact atomic force microscopy." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102180.

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This thesis is devoted to the studies of self-assembled InAs quantum dots (QD) by low-temperature Atomic Force Microscopy (AFM) in frequency modulation mode. Several spectroscopic methods are developed to investigate single electron charging from a two-dimensional electron gas (2DEG) to an individual InAs QD. Furthermore, a new technique to measure the absolute tip-sample capacitance is also demonstrated. The main observables are the electrostatic force between the metal-coated AFM tip and sample as well as the sample-induced energy dissipation, and therefore no tunneling current has to be col
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Yao, Norman Ying. "Topology, Localization, and Quantum Information in Atomic, Molecular and Optical Systems." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11686.

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The scientific interface between atomic, molecular and optical (AMO) physics, condensed matter, and quantum information science has recently led to the development of new insights and tools that bridge the gap between macroscopic quantum behavior and detailed microscopic intuition. While the dialogue between these fields has sharpened our understanding of quantum theory, it has also raised a bevy of new questions regarding the out-of-equilibrium dynamics and control of many-body systems. This thesis is motivated by experimental advances that make it possible to produce and probe isolated, stro
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34

Roseman, Mark A. "Design and characteristics of a low-temperature atomic force microscope." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ44260.pdf.

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35

Parsons, Maxwell F. "Probing the Hubbard Model With Single-Site Resolution." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493308.

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Strongly-correlated electron systems generate some of the richest phenomena and most challenging theoretical problems studied in physics. One approach to understanding these systems is with ultracold fermionic atoms in optical lattices, which can provide a level of control and ways of observing strongly-correlated fermionic systems that are not accessible with conventional materials. This thesis describes the development of an experimental technique where a quantum gas of fermionic 6Li atoms is prepared in a two-dimensional optical lattice and each atom can be frozen in place and imaged with s
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36

Paramonov, Pavel B. "Theoretical Modeling of the Nanostructure Formation in Soft Condensed Matter Using Atomic Force Microscopy." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1123016038.

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37

Giacalone, Giuliano. "A matter of shape : seeing the deformation of atomic nuclei at high-energy colliders." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP072.

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Les expériences conduites au collisionneurs de particules BNL RHIC et CERN LHC montrent que l'émission azimutale de hadrons vers l'état final des collisions relativistes noyau-noyau est fortement anisotrope. Cette observation est compatible avec un paradigme hydrodynamique, selon lequel les hadrons observés dans l'état final sont émis à l'issue de l'expansion d'un milieu fluidiforme créée dans la région d'interaction. Ce paradigme prédit notamment que l'anisotropie de l'émission des particules est sensible à la déformation de l'état fondamental des noyaux interagissants. A travers des comparai
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38

CAMPIGLIO, PAOLO. "Growth and magnetism of patterned atomic and molecular nanostructures." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/24288.

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The present thesis work deals with the study of the growth and properties of surface supported metallic, molecular and hybrid nanostructures. The fabrication of these nanostructures is made by following complementary approaches, namely self-organized growth of metal islands and dippen nanolithography. A common feature is to exploit the self-organization and self-assembly of metals and molecules on Au surfaces. However, in one case atoms spontaneously organize thanks to the Au surface reconstruction, while in the other one the pattern arises from a localized delivery of molecular components
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39

Miller, David Lee. "Atomic-scale spectroscopy and mapping of magnetic states in epitaxial graphene." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37239.

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Graphene grown epitaxially on silicon carbide provides a potential avenue toward industrial-scale graphene electronics. A predominant aspect of the multilayer graphene produced on the carbon-terminated (000 -1) face of SiC is the rotational stacking faults between graphene layers and their associated moire-pattern superlattice. We use scanning tunneling microscopy (STM) and spectroscopy (STS) in high magnetic fields to obtain detailed information about the "massless Dirac fermions" that carry charge in graphene. In agreement with prior investigations, we find that for small magnetic fields, t
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40

Macaluso, Elia. "Probing Quasihole and Edge Excitations of Atomic and Photonic Fractional Quantum Hall Systems." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/250215.

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The discovery of the fractional quantum Hall effect for two-dimensional electron gases immersed in a strong orthogonal magnetic field represents a cornerstone of modern physics. The states responsible for the appearance of the fractional quantum Hall effect have been found to be part of a whole new class of phases of matter, characterized by an internal order with unprecedented properties and known as topological order. This fact opened up a completely new territory for physical studies, paving the way towards many of the current hot topics in physics, such as topological phases of matter, top
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Macaluso, Elia. "Probing Quasihole and Edge Excitations of Atomic and Photonic Fractional Quantum Hall Systems." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/250215.

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The discovery of the fractional quantum Hall effect for two-dimensional electron gases immersed in a strong orthogonal magnetic field represents a cornerstone of modern physics. The states responsible for the appearance of the fractional quantum Hall effect have been found to be part of a whole new class of phases of matter, characterized by an internal order with unprecedented properties and known as topological order. This fact opened up a completely new territory for physical studies, paving the way towards many of the current hot topics in physics, such as topological phases of matter, top
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Schröder, Jan. "Aspects of quantum gravity and matter." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/54172/.

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A quantum theory of gravity remains one of the greatest challenges of contemporary physics. It is well established that a perturbative treatment of gravity as a quantum field theory leads to a non-renormalisable setup. However gravity could still exist as a consistent and predictive quantum field theory on a non-perturbative level. This is explored in the asymptotic safety scenario which was initially proposed by S. Weinberg. In this thesis we investigate the ultraviolet behaviour of gravity within the asymptotic safety conjecture and discuss phenomenological implications. We start out by intr
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McBride, Sean P. "Surface science experiments involving the atomic force microscope." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13459.

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Doctor of Philosophy<br>Department of Physics<br>Bruce M. Law<br>Three diverse first author surfaces science experiments conducted by Sean P. McBride 1-3 will be discussed in detail and supplemented by secondary co-author projects by Sean P. McBride, 4-7 all of which rely heavily on the use of an atomic force microscope (AFM). First, the slip length parameter, b of liquids is investigated using colloidal probe AFM. The slip length describes how easily a fluid flows over an interface. The slip length, with its exact origin unknown and dependencies not overwhelming decided upon by the
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Jarvis, Samuel Paul. "The effect of tip structure in atomic manipulation : a combined DFT and AFM study." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/14047/.

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Non-contact atomic force microscopy allows us to directly probe the interactions between atoms and molecules. When operated in UHV and at low temperatures, a host of experiments, uniquely possible with the technique, can be carried out. The AFM allows us to characterise the forces present on a surface, resolve the atomic structure of molecules, measure the force required to move an atom, and even directly measure molecular pair potentials. Generally speaking, it is the interaction between the outermost tip and surface atoms that we measure. Therefore, in each of these experiments, understandin
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Négréa, Daniel. "Proton-neutron pairing correlations in atomic nuclei." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00870588.

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The common understanding of proton-neutron pairing, whose fingerprints are currently investigated in N = Z nuclei, relies on Cooper pair mechanism and BCS-type models. In the present thesis we present an alternative approach which, contrary to BCS models, conserves exactly the particle number and the isospin. In this approach the ground state of N=Z nuclei is described as a condensate of alpha-like quartets built by two neutrons and two protons coupled to the total isospin T=0 and total spin J=0. The comparison with exact shell model calculations shows that the quartet condensation model (QCM)
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Kaya, Dilan. "Quantal Effects On Growth Of Instabilities In Nuclear Matter." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/1116037/index.pdf.

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The quantal Boltzmann&ndash<br>Langevin equation is used to obtain a dispersion relation for the growth rates of instabilities in infinite nuclear matter. The dispersion relation is solved numerically for three different potentials. The quantal results are compared with the semi-classical solutions. It is seen that with the inclusion of the quantal effects the growth rates of the fastest growing modes in the system are reduced and these modes have the tendency to occur at longer wavelengths for all the potentials considered. Furthermore, the boundaries of the spinodal region is determined by t
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Wang, Tout Taotao. "Small Diatomic Alkali Molecules at Ultracold Temperatures." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:14226049.

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This thesis describes experimental work done with two of the smallest diatomic alkali molecules, 6Li2 and 23Na6Li, each formed out of its constituent atoms at ultracold temperatures. The 23Na6Li molecule was formed for the first time at ultracold temperatures, after previous attempts failed due to an incorrect assignment of Feshbach resonances in the 6Li+23Na system. The experiment represents successful molecule formation around the most difficult Feshbach resonance ever used, and opens up the possibility of transferring NaLi to its spin-triplet ground state, which has both magnetic and electr
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Yan, Haiyang. "Applications of polarized helium-3 filters in neutron scattering." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3344613.

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Thesis (Ph.D.)--Indiana University, Dept. of Physics, 2008.<br>Title from home page (viewed on Oct 8, 2009). Source: Dissertation Abstracts International, Volume: 70-02, Section: B, page: 1098. Adviser: William Michael Snow.
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Roumiantsev, Ilia. "Many-body effects in low-order optical nonlinearities of semiconductor quantum wells." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280383.

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This dissertation addresses both fundamental aspects of Coulomb correlations in semiconductor quantum wells and more practical aspects of theoretical analysis of semiconductor optoelectronic devices. After introducing the subject, we present and evaluate a state-of-the-art theory of the third order coherent optical response of a semiconductor quantum well based on the Dynamics Controlled Truncation (DCT) scheme. Already in the third order (the so-called chi (3)) regime, semiconductors exhibit a number of many-body Coulomb correlation effects. Their manifestation in various multi-pulse experime
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Park, Sahnggi. "Optics of semiconductor microcavities." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/289077.

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In this work the interactions of carriers, electrons and holes, and photons in a semiconductor microcavity are studied in the perturbative and the nonperturbative regimes. In the perturbative regime, modification of the spontaneous emission rate of carriers by a semiconductor microcavity is investigated with 100-nm-thick bulk GaAs. Reabsorption makes the cavity-mode photoluminescence (PL) decay much faster than the square of the carrier density. Here reabsorption distortion is avoided by collecting PL that escapes the microcavity directly without multiple reflections using a ZnSe prism glued t
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