Transport Properties Of The Two Dimensional Electron Gas In Gaas Algaas Heterostructures
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Transport Properties Of The Two Dimensional Electron Gas In Gaas Algaas Heterostructures
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Author : Barry Jia-fu Lin
language : en
Publisher:
Release Date : 1985
Transport Properties Of The Two Dimensional Electron Gas In Gaas Algaas Heterostructures written by Barry Jia-fu Lin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Electron Transport In Gaas Quantum Dots Under High Frequencies
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Author : Bernard Richard Matis
language : en
Publisher:
Release Date : 2011
Electron Transport In Gaas Quantum Dots Under High Frequencies written by Bernard Richard Matis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Physics categories.
Ph. D.
Magnetotransport Study Of A High Mobility Two Dimensional Electron Gas
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Author : Girish Bohra
language : en
Publisher:
Release Date : 2009
Magnetotransport Study Of A High Mobility Two Dimensional Electron Gas written by Girish Bohra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
This thesis is focused on an experimental study of the electrical properties of a two-dimensional electron gas formed in a GaAs/AlGaAs heterostructure. Low temperature magneto-transport measurements are used to characterize the carrier density and mobility of this system. An extensive study of the temperature and current dependence of quantum-mechanical transport effects, observable at very low temperatures, is performed in the temperature range of 4.2-100 K, for measurement currents in the range of 10 nA- 100℗æA. The well-known decrease in the amplitude of the Shubnikov-de Haas effect, and an accompanying increase in the onset magnetic field of these oscillations, with increasing temperature, as well as a simultaneous suppression of the quantum-Hall effect, is observed. Similar behavior is found on increasing the measurement current. An analysis of the insulator to quantum Hall transition (I-QH), occurring in the two-dimensional electron gas at low perpendicular magnetic fields, is also reported, along with the results of investigations of electron heating based on the measurements of the energy-loss rate. This study shows that the direct I-QH transition does not always correspond to the onset of strong localization, with clear Shubnikov-de Haas oscillations being observed in the insulating regime. A linear dependence of the electron energy-loss rate and electron temperature in the temperature range of 4.2-40 K is determined, indicating that the main mechanism for electron energy relaxation is acoustic phonon scattering.
Electrical Measurement Of Spin Dependent Resistivity In Gaas Algaas Two Dimensional Electron Gas
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Author :
language : en
Publisher:
Release Date : 2009
Electrical Measurement Of Spin Dependent Resistivity In Gaas Algaas Two Dimensional Electron Gas written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
The electrical transport in the semiconductor two-dimensional electron gases (2DEGs) in the presence of magnetic fields have been the subject of extensive experimental and theoretical studies. Whereas the experiments generally focus on the total magnetotransport of the spin-up and spin-down electrons, the problem of how individual spin components contribute to the sum has been mostly remained untouched. Due to the Zeeman splitting of the Fermi velocities, spin-up and spin-down electrons face different resistivities against their flow. In this thesis, this problem is addressed based on electrical generation and detection of nonequilibrium spin polarization in a narrow conducting channel of 2DEG in a GaAs/AlGaAs heterostructure. It makes use of narrow quasi-one-dimensional constrictions, known as quantum point contacts (QPCs), at a high magnetic field as the injector and detector of the spin polarization. We also simulate the problem based on an one-dimensional spin diffusion model and it turns out that it numerically agrees with the measurements using an electron spin susceptibility which is enhanced compared to that of bare GaAs. Such enhancements are generally linked with the electron-electron interactions which become important for electrons in confined geometries. The first section reviews the general characteristic properties of 2DEGs in GaAs/AlGaAs semiconductor heterostructures, gate-defined structures and quantized electrical transport through QPCs. The second chapter reviews the main results of electronic transport measurements on 2DEGs in the presence of in-plane magnetic fields, and the third chapter includes our spin polarization measurement results in a narrow channel of 2DEG and how they help to account for the effect of spin orientation on the electrical resistivity.
Mesoscopic Electron Transport
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Author : Lydia L. Sohn
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Mesoscopic Electron Transport written by Lydia L. Sohn and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Science categories.
Ongoing developments in nanofabrication technology and the availability of novel materials have led to the emergence and evolution of new topics for mesoscopic research, including scanning-tunnelling microscopic studies of few-atom metallic clusters, discrete energy level spectroscopy, the prediction of Kondo-type physics in the transport properties of quantum dots, time dependent effects, and the properties of interacting systems, e.g. of Luttinger liquids. The overall understanding of each of these areas is still incomplete; nevertheless, with the foundations laid by studies in the more traditional systems there is no doubt that these new areas will advance mesoscopic electron transport to a new phenomenological level, both experimentally and theoretically. Mesoscopic Electron Transport highlights selected areas in the field, provides a comprehensive review of such systems, and also serves as an introduction to the new and developing areas of mesoscopic electron transport.
The Physics Of The Two Dimensional Electron Gas
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Author : J.T. Devreese
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
The Physics Of The Two Dimensional Electron Gas written by J.T. Devreese and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
The 1986 Advanced Study Institute on "The Physics of the two-Dimen sional Electron Gas" took place at the Conference Centre liTer Helme", close to Oostende (Belgium), from June 2 till 16, 1986. We were motivated to organize this Advanced Study Institute in view of the recent experimental and theoretical progress in the study of the two-dimensional electron gas. An additional motivation was our own theore tical interest in cyclotron resonance in two-dimensional electron systems at our institute. It is my pleasure to thank several instances and people who made this Advanced Study Institute possible. First of all, the sponsor of the Advanced Study Institute, the NATO Scientific Committee. Furthermore, the co sponsors: Agfa Gevaert, Bell Telephone Mfg. Co. N.V., Burroughs Belgium. Control Data. Digital Equipment Corporation, Esso Belgium. European Research Office (USA). Kredietbank. National Science Foundation (USA). Special thanks are due to the members of the Program Committee and the members of the Organizing Committee. I would also like to thank Mrs. H. Evans for typing assistance.
Theory Of Transport Properties Of Semiconductor Nanostructures
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Author : Eckehard Schöll
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-27
Theory Of Transport Properties Of Semiconductor Nanostructures written by Eckehard Schöll and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-27 with Technology & Engineering categories.
Recent advances in the fabrication of semiconductors have created almost un limited possibilities to design structures on a nanometre scale with extraordinary electronic and optoelectronic properties. The theoretical understanding of elec trical transport in such nanostructures is of utmost importance for future device applications. This represents a challenging issue of today's basic research since it requires advanced theoretical techniques to cope with the quantum limit of charge transport, ultrafast carrier dynamics and strongly nonlinear high-field ef fects. This book, which appears in the electronic materials series, presents an over view of the theoretical background and recent developments in the theory of electrical transport in semiconductor nanostructures. It contains 11 chapters which are written by experts in their fields. Starting with a tutorial introduction to the subject in Chapter 1, it proceeds to present different approaches to transport theory. The semiclassical Boltzmann transport equation is in the centre of the next three chapters. Hydrodynamic moment equations (Chapter 2), Monte Carlo techniques (Chapter 3) and the cellular au tomaton approach (Chapter 4) are introduced and illustrated with applications to nanometre structures and device simulation. A full quantum-transport theory covering the Kubo formalism and nonequilibrium Green's functions (Chapter 5) as well as the density matrix theory (Chapter 6) is then presented.
Electron Transport In Gaas Heterostructures At Various Magnetic Field Strengths
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Author : Jeffrey Burnham Miller
language : en
Publisher:
Release Date : 2007
Electron Transport In Gaas Heterostructures At Various Magnetic Field Strengths written by Jeffrey Burnham Miller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
In the first set of experiments---the low-field experiments---we studied the effect of spin-orbit coupling. We tuned the strength of spin-orbit coupling from the weak localization regime to the antilocalization regime using in situ gate control. Using a new theory, we separately extracted the values for the three material-dependent spin-orbit constants. We also measured the average and variance of conductance in assorted quantum dots, with and without strong spin-orbit coupling, and found quantitative agreement with recent random matrix theory predictions, as long as we also properly included the effects of parallel magnetic field.
Gaas And Related Materials
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Author : Sadao Adachi
language : en
Publisher: World Scientific
Release Date : 1994
Gaas And Related Materials written by Sadao Adachi and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Technology & Engineering categories.
This book covers the various material properties of bulk GaAs and related materials, and aspects of the physics of artificial semiconductor microstructures, such as quantum wells and superlattices, made of these materials. A complete set of the material properties are considered in this book. They are structural properties; thermal properties; elastic and lattice vibronic properties; collective effects and some response characteristics; electronic energy-band structure and consequences; optical, elasto-optic, and electro-optic properties; and carrier transport properties. This book attempts to summarize, in graphical and tabular forms, most of the important theoretical and experimental results on these material properties. It contains a large number of references useful for further study. Timely topics are discussed as well. This book will be of interest to graduate students, scientists and engineers working on semiconductors.
Two Dimensional Systems Physics And New Devices
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Author : Günther Bauer
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Two Dimensional Systems Physics And New Devices written by Günther Bauer and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Technology & Engineering categories.
In the series of International Winter Schools on New Developments in Solid State Physics, the fourth one was devoted to the subject: "Two Dimensional Systems: Physics and Devices". For the second time the pro ceedings of one of these Winter Schools appear as a volume in the Springer Series in Solid-State Sciences (the earlier proceedings were published as Vol. 53). The school was held in the castle of MauterndorfjSalzburg (Austria) February 24-28, 1986. These proceedings contain contributions ba:sed on the thirty invited lectures. The school was attended by 179 registered participants (40% students), who came from western European countries, the United States of America, Japan, the People's Republic of China and Poland. As far as the subjects are conterned, several papers deal with the growth and characterization of heterostructures. Dynamical RHEED tech niques are described as a tool for in situ studies of MBE growth mech anisms. Various growth techniques, including MBE, MOMBE, MOCVD and modifications of these, are discussed. The limiting fa.ctors for the carrier mobilities and the inftuence of the spacer thickness in single het erostructures of GaAs/GaAIAs seem to be understood and are no longer a matter of controversy. In addition, the growth of two fascinating systems, Si/SiGe and Hg _ Cd Te/CdTe, is discussed in detail