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Dissertations / Theses on the topic 'Quantum point contacts'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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1

Ren, Yuan. "Spin effects in quantum point contacts." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37736.

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Quantum point contacts (QPCs) are narrow constrictions between large reservoirs of two-dimensional electron gas, with conductance quantized in units of G=2e²/h at zero magnetic field. Despite decades of investigation, some conductance features of QPCs remain mysterious, such as an extra conductance plateau at 0.7(2e²/h) (0.7 structure) and a zero-bias peak (ZBP) in nonlinear conductance. In this thesis, we present experimental studies of transport anomalies in QPCs, aiming at shedding more light on these features. Conductance measurements are performed for ZBPs in a much wider range than in mo

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2

Heyder, Jan. "The 0.7 anomaly in quantum point contacts." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-178912.

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This thesis aims at shedding light on the microscopic origin of a phenomenon in the field of semiconductor nanostructures, which occurs in transport through a short and narrow quasi one-dimensional constriction, the quantum point contact (QPC). Unlike the stepwise increase of linear conductance of a QPC as function of its width in units of the quantum GQ, which is well understood and was predicted already in the 1950s, an additional shoulder-like step at 0.7xG_Q raises questions since its discovery in 1996 : the 0.7 anomaly. Subsequent experimental investigations revealed a plethora of accompa

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3

Liu, Tai-Min. "Electronic Interactions in Semiconductor Quantum Dots and Quantum Point Contacts." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1311773375.

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4

Keyser, Ulrich Felix. "Nanolithography with an atomic force microscope quantum point contacts, quantum dots, and quantum rings /." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966282337.

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5

Gustafsson, Alexander. "Electron transport in quantum point contacts : A theoretical study." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-10771.

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Electron transport in mesoscopic systems, such as quantum point contacts and Aharonov-Bohm rings are investigated numerically in a tight-binding language with a recursive Green's function algorithm. The simulation reveals among other things the quantized nature of the conductance in point contacts, the Hall conductance, the decreasing sensitivity to scattering impurities in a magnetic field, and the periodic magnetoconductance in an Aharonov-Bohm ring. Furthermore, the probability density distributions for some different setups are mapped, making the transmission coefficients, the quantum Hall

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6

Moore, Lindsay Shannon. "Novel devices for measuring interactions in quantum point contacts /." May be available electronically:, 2009. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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7

Hadji-Ristic, Daniel Ilan. "Thermo-electric and transport properties of etched quantum point contacts." Thesis, Royal Holloway, University of London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444164.

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8

Bauer, Florian. "Microscopic Origin of the 0.7-Anomaly in Quantum Point Contacts." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-178928.

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A Quantum point contact (QPC) is a one dimensional constriction, separating two extended electron systems allowing transport between them only though a short and narrow channel. The linear conductance of QPCs is quantized in units of the conductance quantum G_Q=2e^2/h, where e is the electron charge and h is Planck's constant. Thus the conductance shows a staircase when plotted as a function of gate-voltage which defines the width of the channel. In addition measured curves show a shoulder-like step around 0.7G_Q. In this regime QPCs show anomalous behaviour in quantities like electri

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9

Freudenfeld, Jaan [Verfasser]. "Coupling Quantum Point Contacts via Ballistic Electron Optics / Jaan Freudenfeld." Berlin : Freie Universität Berlin, 2021. http://d-nb.info/123127607X/34.

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10

Jones, Alexander M. "Onset of Spin Polarization in Four-Gate Quantum Point Contacts." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1485188708345005.

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11

Donehoo, Brandon. "A superconducting investigation of nanoscale mechanics in niobium quantum point contacts." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24784.

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Thesis (Ph.D.)--Physics, Georgia Institute of Technology, 2008.<br>Committee Chair: Alexei Marchenkov; Committee Member: Bruno Frazier; Committee Member: Dragomir Davidovic; Committee Member: Markus Kindermann; Committee Member: Phillip First

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12

Dutta, Maitreya. "Hysteresis in the Conductance of Quantum Point Contacts with In-Plane Side Gates." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1396530257.

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13

RAHMAN, S. M. SAYDUR. "Spontaneous Spin Polarization due to Lateral Spin Orbit Coupling in InAs Quantum Point Contacts." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196103387.

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14

Bretheau, L. "LOCALIZED EXCITATIONS IN SUPERCONDUCTING POINT CONTACTS: PROBING THE ANDREEV DOUBLET." Phd thesis, Ecole Polytechnique X, 2013. http://tel.archives-ouvertes.fr/tel-00772851.

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L'effet Josephson décrit le couplage cohérent entre supraconducteurs et le supercourant qui en résulte. D'un point de vue microscopique, il découle de l'existence d'états de quasiparticules discrets, localisés au niveau du lien faible, les états liés d'Andreev. Ils viennent en doublets dans chaque canal de conduction du lien faible, avec des énergies et supercourants opposés. Chaque doublet d'Andreev donne lieu à quatre états: l'état fondamental \left|-\right\rangle et l'état excité \left|+\right\rangle , avec une parité paire, et les états excités impairs \left|\uparrow\right\rangle et \left|

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15

Bauer, Florian [Verfasser], and Delft Jan [Akademischer Betreuer] von. "Microscopic Origin of the 0.7-Anomaly in Quantum Point Contacts / Florian Bauer. Betreuer: Jan von Delft." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1067399690/34.

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16

Zimmermann, Katrin. "Contacts ponctuels quantiques dans le graphène de haute mobilité." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY008/document.

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Dans le régime de l'effet Hall quantique, les porteurs de charge se propagent le long de canaux unidimensionnels situés au bords d'un gaz d'électron bidimensionel (2D electron gas, 2DEG). Un contact ponctuel quantique (quantum point contact, QPC) - une constriction étroite confinant spatialement le gaz électronique - permet de contrôler la transmission de ces canaux de bords. Dans un 2DEG conventionnel, une tension négative appliquée sur les grilles électrostatiques du QPC engendre la déplétion locale du gaz électronique sous la grille, forçant les électrons à se propager au travers de la cons

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17

Dai, Zhenting. "Coherent and Dissipative Transport in Metallic Atomic-Size Contacts." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/19880.

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Thin-film niobium mechanically controlled break junctions and resistively shunted niobium mechanically-controlled break junctions were developed and successfully microfabricated. Using these devices, high-stability atomic size contacts were routinely produced and investigated both in the normal and superconducting states. Investigations of the two-level conductance fluctuations in the smallest contacts allowed the calculation of their specific atomic structure. Embedding resistive shunts close to the superconducting atomic-sized junctions affected the coherence of the electronic transport. Fin

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18

Szewc, Wojciech. "Theory and simulation of scanning gate microscopy : applied to the investigation of transport in quantum point contacts." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00876522.

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This work is concerned with the theoretical description of the Scanning Gate Microscopy (SGM) in general and with solving particular models of the quantum point contact (QPC) nanostructure, analytically and numerically. SGM is an experimental technique, which measures the conductance of a nanostructure, while a charged AFM tip is scanned above its surface. It gives many interesting results, such as lobed and branched images, interference fringes and a chequerboard pattern. A generally applicable theory, allowing for unambiguous interpretation of the results, is still missing. Using the Lippman

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19

Sloggett, Clare Physics Faculty of Science UNSW. "Electron correlations in mesoscopic systems." Awarded by:University of New South Wales. School of Physics, 2007. http://handle.unsw.edu.au/1959.4/31875.

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This thesis deals with electron correlation effects within low-dimensional, mesoscopic systems. We study phenomena within two different types of system in which correlations play an important role. The first involves the spectra and spin structure of small symmetric quantum dots, or &quoteartificial atoms&quote. The second is the &quote0.7 structure&quote, a well-known but mysterious anomalous conductance plateau which occurs in the conductance profile of a quantum point contact. Artificial atoms are manufactured mesoscopic devices: quantum dots which resemble real atoms in that their symmetr

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20

Schulz, Leonhard Ferdinand [Verfasser], and Klaus [Akademischer Betreuer] Klitzing. "Parallel arrangements of quantum dots and quantum point contacts in high magnetic fields : periodic conductance modulations with magnetic flux change / Leonhard Ferdinand Schulz. Betreuer: Klaus Klitzing." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2015. http://d-nb.info/1065235798/34.

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21

Heyder, Jan [Verfasser], and Jan von [Akademischer Betreuer] Delft. "The 0.7 anomaly in quantum point contacts : a microscopic model for the first conductance step / Jan Heyder. Betreuer: Jan von Delft." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1066206635/34.

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22

Weidinger, Lukas [Verfasser], and Jan von [Akademischer Betreuer] Delft. "Finite-ranged interactions and multiband effects in quantum point contacts : a functional renormalization group study / Lukas Weidinger ; Betreuer: Jan von Delft." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2021. http://d-nb.info/1233201271/34.

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23

Ngo, Anh T. "Spin-orbit Effects and Electronic Transport in Nanostructures." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1292260134.

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24

Percebois, Gaëtan. "Quantum transport in two-dimensional systems : artificial intelligence applied to material science." Electronic Thesis or Diss., Strasbourg, 2023. http://www.theses.fr/2023STRAE033.

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Les hétérostructures représentent l'un des dispositifs les plus largement utilisés pour générer un gaz d'électrons bidimensionnel (2DEG). Cependant, les propriétés exactes de transport des électrons au sein de tels dispositifs ne sont pas complètement contrôlables et prévisibles. Cela est principalement dû à la présence de dopants ionisés, nécessaires à la création du gaz d’électrons, qui impactent le mouvement des électrons par le biais d'interactions coulombiennes, entraînant ainsi un potentiel de désordre. Dans cette étude, nous introduisons une méthode pour déterminer ce désordre en utilis

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25

Ly, Ousmane. "Microscopie à grille locale comme outil d’extraction des propriétés électroniques locales en transport quantique." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE022/document.

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La technique de la microscopie à grille de balayage (SGM) consiste à mesurer la conductance d'un gaz bidimensionnel d'électrons (2DEG) sous l'influence d'une pointe balayant la surface de l'échantillon. Dans ce travail, une approche analytique complétée par des simulations numériques est développée pour étudier la relation entre les mesures SGM et les propriétés électroniques locales dans des systèmes mésoscopiques. La correspondance entre la réponse SGM et la densité locale partielle (PLDOS) est étudiée pour un contact quantique entouré d’un 2DEG en présence ou en absence de désordre, pour un

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26

Cipiloglu, Mustafa Ali. "Thermoelectric Effects In Mesoscopic Physics." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604753/index.pdf.

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The electrical and thermal conductance and the Seebeck coefficient are calculated for one-dimensional systems, and their behavior as a function of temperature and chemical potential is investigated. It is shown that the conductances are proportional to an average of the transmission probability around the Fermi level with the average taken for the thermal conductance being over a wider range. This has the effect of creating less well-defined plateaus for thermal-conductance quantization experiments. For weak non-linearities, the charge and entropy currents across a quantum point contact are ex

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27

Gustafsson, Alexander. "Quantum point contact : A theoretical study." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-6571.

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<p>Experiments shows that the conductance of a quantum point contact is quantized in steps of 2e²/h, where e is the charge of the electron and h is Planck’s constant, and thereby Ohm’s law is not valid for nanostructures. By using the approximation method finite difference, the transmission for one-dimensional contacts and one- and two-dimensional potentials are investigated. In the case of two-dimensional contacts and a two-dimensional potential the Green’s function method is used. It turns out that if electrons are treated as waves, the transmission and the conductance just differ by the co

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28

Johansson, Erik. "Quantized Transmission in an Asymmetrically Biased Quantum Point Contact." Thesis, Linköpings universitet, Teoretisk Fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-133185.

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In this project work we have studied how a two-dimensional electron gas (2DEG) in a GaAs/AlGaAs semiconductor heterostructure can be locally confined down to a narrow bottleneck constriction called a quantum point contact (QPC) and form an artificial quantum wire using a split-gate technique by application of negative bias voltages. The electron transport through the QPC and how asymmetric loading of bias voltages affects the nature of quantized conductance were studied. The basis is Thomas-Fermi simulations that within the Büttiker model give results somewhat similar to experimental work in

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29

Das, Partha Pratim. "Generation of Spin Polarization in Side-Gated InAs Quantum Point Contact." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1344874808.

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30

Vaidya, Nikhilesh Avanish. "NOISE SPECTRUM OF A QUANTUM POINT CONTACT COUPLED TO A NANO-MECHANICAL OSCILLATOR." Diss., Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/447885.

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Physics<br>Ph.D.<br>With the advance in nanotechnology, we are more interested in the "smaller worlds". One of the practical applications of this is to measure a very small displacement or the mass of a nano-mechanical object. To measure such properties, one needs a very sensitive detector. A quantum point contact (QPC) is one of the most sensitive detectors. In a QPC, electrons tunnel one by one through a tunnel junction (a "hole"). The tunnel junction in a QPC consists of a narrow constriction (nm-wide) between two conductors. To measure the properties of a nano-mechanical object (which acts

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31

Schubert, Enrico [Verfasser], and Alexander [Akademischer Betreuer] Högele. "Transport and optical spectroscopy of a quantum point contact / Enrico Schubert ; Betreuer: Alexander Högele." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2016. http://d-nb.info/1125883960/34.

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32

Choi, Deung jang. "Kondo effect and detection of a spin-polarized current in a quantum point contact." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAE029/document.

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L'effet Kondo observé dans des objets individuels constitue un système modèle pour l’étude de corrélations électroniques. Ces dernières jouent un rôle moteur dans le domaine émergent de l'électronique de spin (ou spintronique) où l’utilisation d’atomes issus des terres rares et des métaux de transition est incontournable. Dans ce contexte, l’étude de l'interaction d’une impureté Kondo avec des électrodes ferromagnétiques ou avec d’autres impuretés magnétiques peut donc s’avérer fondamental pour la spintronique. L’effet Kondo est sensible à son environnement magnétique car en présence d’interac

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33

Brun, Boris. "Electron interactions in mesoscopic physics : Scanning Gate Microscopy and interferometry at a quantum point contact." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY049/document.

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Au cours de cette thèse nous avons étudié les effets des interactions entre électrons dansles contacts ponctuels quantiques (QPCs). Les contacts ponctuels quantiques sont des petitscanaux quasi-unidimensionnels, définis à partir de gaz électroniques bidimensionnelsde haute mobilité (2DEG). Une tension négative appliquée sur des grilles métalliques audessus de la surface permet d’ouvrir ou fermer le QPC. Lorsqu’un QPC s’ouvre, de plusen plus de modes électroniques peuvent traverser le QPC, et sa conductance augmente parpas discrets, séparés par un quantum de conductance 2e2/h. On peut le compre

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34

Oxtoby, Neil Paul. "Keeping it real': A Quantum Trajectory Approach to Realistic Measurement of Solid-State Quantum Systems." Thesis, Griffith University, 2007. http://hdl.handle.net/10072/365770.

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To obtain information about a system of interest a measurement has to be made. In experiments that probe the quantum nature of our world, the system itself is, in general, necessarily affected by the act of measurement. If the system is weakly coupled to its bath and the dynamics are such that information concerning the system is spread throughout the many degrees of freedom of the bath, and the bath is being measured then a stochastic master equation for the conditioned state of the system can be found. This is termed a quantum trajectory equation. Realistic detectors are not perfect. Inform

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35

Dillard, Colin. "Quasiparticle Tunneling and High Bias Breakdown in the Fractional Quantum Hall Effect." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10334.

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The integer and fractional quantum Hall eﬀects arise in two-dimensional electron systems subject to low temperature and high perpendicular magnetic ﬁeld. The phenomenology of these two eﬀects is rich and provides interesting insight into quantum physics. We present two experimental studies of phenomena in the fractional quantum Hall regime. The ﬁrst examines the tunneling conductance of quasiparticles at ﬁlling factor 5/2. This state is of signiﬁcant interest because it lies outside the traditional Jain hierarchy of fractional quantum Hall states and because it may be the ﬁrst physical system

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36

Ma, Pengcheng. "Using multiplexers to study the statistics of quantum phenomenon in one-dimensional wires." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/270301.

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The quantum point contact (QPC) is a one-dimensional constriction with the differential conductance quantised in units of $G_Q=2e^2/h$. However, the transport behaviour below the first plateau is still not fully understood, including the 0.7 anomaly and the 0.25 anomaly in the linear and non-linear transport regimes respectively. In this work, we utilise a multiplexing technique and statistically investigate the 0.7 anomaly observed on the first three plateaus respectively in 571 QPCs, fitting well the van-Hove model. The 0.7 anomaly shows the transconductance suppression due to the effective

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37

Grémion, Emile. "Transistor balistique quantique et HEMT bas-bruit pour la cryoélectronique inférieure à 4. 2 K." Paris 11, 2008. http://www.theses.fr/2008PA112017.

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Pour augmenter la résolution globale des détecteurs à très basse température, aujourd'hui couramment utilisés dans de nombreux champs de la physique des particules et de l'univers, les expériences à venir ne pourront faire l'économie du développement d'une cryo-électronique performante, à la fois moins bruyante et plus proche du détecteur. Dans ce contexte, ce travail s'intéresse aux possibilités offertes par les gaz d'électrons bidimensionnels (2DEG) GaAlAs/GaAs à travers l'étude expérimentale de deux composants distincts : les QPC (Quantum Point Contact) et les HEMT (High Electron Mobility T

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Hakanen, Jani. "Modeling of nanostructures with complex source and drain." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4285.

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<p>In this thesis we report on calculations for open quantum mechanical and certain microwave systems. The models refer to a quantum point contact and an electron cavity. We model this open system with an imaginary potential as source and drain, and use the finite difference method to make our calculations. We report on general features of the model we have found, and compare our calculations with measurements made on microwave cavities.</p>

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Seoudi, Tarek. "Non-intrusive CdSe-based quantum dots for sensing pressure and temperature in lubricated contacts." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI009.

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Cette thèse est dédiée à la mesure des pressions et des températures locales et à la comparaison de la génération de chaleur dans les contacts élastohydrodynamiques (EHD) de type tout acier et hybride (nitrure de silicium-acier). Le but ultime de ce travail est de développer une nouvelle technique in situ non-intrusive, exploitant la sensibilité de la photoluminescence (PL) des boîtes quantiques (QDs) de CdSe/CdS/ZnS aux variations de pression et température, afin de cartographier ces deux paramètres dans les contacts EHD. Dispersible à faible concentration dans les lubrifiants, il est montré

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40

Wan, Junjun. "Towards the realization of an all electrically controlled Spin Field Effect Transistor." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1292519781.

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Bhandari, Nikhil K. "Tunable All Electric Spin Polarizer." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1393237571.

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42

Ruiz-Tijerina, David A. "Kondo Physics and Many-Body Effects in Quantum Dots and Molecular Junctions." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1385982088.

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43

Chen, Peng-Jen. "Density functional study on quantum point contacts." 2008. http://proquest.umi.com/pqdweb?did=1588785451&sid=4&Fmt=2&clientId=39334&RQT=309&VName=PQD.

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Thesis (M.S.)--State University of New York at Buffalo, 2008.<br>Title from PDF title page (viewed on Jan. 15, 2009) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Han, Jong E. Includes bibliographical references.

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Chen, Wei-Ren, and 陳偉仁. "Electrical transport in multiple gated quantum point contacts." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/zm3nk7.

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Yoon, Youngsoo. "Readout of electron spins in quantum point contacts." 2008. http://proquest.umi.com/pqdweb?did=1542160001&sid=8&Fmt=2&clientId=39334&RQT=309&VName=PQD.

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Thesis (Ph.D.)--State University of New York at Buffalo, 2008.<br>Title from PDF title page (viewed on Dec. 2, 2008) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Bird, Jonathan P. Includes bibliographical references.

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Hsieh, Sung-Hsien, and 謝松憲. "Nonequilibrium Transport phenomena in GaAs Quantum Point Contacts." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/37453322413045813462.

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47

唐志雄. "= Time-modulated effects on the quantum transport in quantum point contacts." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/85670044905416118853.

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48

Zhang, Hao. "Electronic and Spin Correlations in Asymmetric Quantum Point Contacts." Diss., 2014. http://hdl.handle.net/10161/9036.

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<p>A quantum point contact (QPC) is a quasi-one dimensional electron system, for which the conductance is quantized in unit of $2e^2/h$. This conductance quantization can be explained in a simple single particle picture, where the electron density of states cancels the electron velocity to a constant. However, two significant features in QPCs were discovered in the past two decades, which have drawn much attention: the 0.7 effect in the linear conductance and zero-bias-anomaly (ZBA) in the differential conductance. Neither of them can be explained by single particle pictures.</p><p>In this the

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羅東昇. "Quantum decoherence and spin-polarized currents in quantum wires — studied by parallel coupled double quantum point contacts." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/852t6r.

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博士<br>國立清華大學<br>物理系<br>101<br>We employ coupled parallel double quantum point contacts to study the quantum decoherence and the transport of spin-polarized currents in quantum wires. The devices are fabricated on the GaAs/Al0.3Ga0.7As heterostructures with two-dimensional electron gas. In the experiment, the structure of quantum wires are formed on the layer of two-dimensional electron gas by means of quantum point contacts, and the electrical transport measurements are done at ultra-low temperatures. We study the phase coherence in a quantum-wire system by quantum interference phenomena, and

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Keyser, Ulrich Felix [Verfasser]. "Nanolithography with an atomic force microscope : quantum point contacts, quantum dots, and quantum rings / von Ulrich Felix Keyser." 2002. http://d-nb.info/966282337/34.

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