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Interacting Two Dimensional Electron And Hole Systems In Perpendicular Magnetic Fields
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Book Synopsis Interacting Two-Dimensional Electron and Hole Systems in Perpendicular Magnetic Fields by : Meng Ma
Download or read book Interacting Two-Dimensional Electron and Hole Systems in Perpendicular Magnetic Fields written by Meng Ma and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron and hole systems confined in two dimensions exhibit a plethora of exotic quantum phases under perpendicular magnetic field at sufficiently low temperature. In this thesis, we explore several of these quantum phases in state-of-the-art high-quality InAs and GaAs quantum wells and study their formation, phase diagram, and geometric resonance behavior under a one-dimensional periodic magnetic modulation.The two-dimensional (2D) electron system in an InAs quantum well has emerged as a prime candidate for hosting exotic quasi-particles with non-abelian statistics such as Majorana fermions and parafermions. To attain its full promise, however, the electron system has to be clean enough to exhibit electron-electron interaction phenomena. In the first part of the thesis, we present the observation of the fractional quantum Hall effect in a very low disorder InAs quantum well. At sufficiently low temperature and very high perpendicular magnetic field, a deep minimum in the longitudinal resistance, accompanied by a nearly quantized Hall plateau at Landau level filling factor nu=4/3 was observed.A sufficiently large perpendicular magnetic field quenches the kinetic (Fermi) energy of an interacting 2D system of fermions, making them susceptible to the formation of a Wigner solid (WS) phase in which the charged carriers organize themselves in a periodic array to minimize their Coulomb repulsion energy. In low-disorder 2D electron systems confined to modulation-doped GaAs heterostructures, signatures of a magnetic-field-induced WS appear at low temperatures and very small Landau level filling factors (nu~1/5). In dilute GaAs 2D hole systems, on the other hand, thanks to the larger hole effective mass and the ensuing Landau level mixing, the WS forms at relatively higher fillings (nu~1/3). In the second part of the thesis, we present our measurements of the fundamental temperature vs. filling phase diagram for the 2D holes' WS-liquid thermal melting. Moreover, via changing the 2D hole density, we also probe their Landau level mixing vs. filling WS-liquid quantum melting phase diagram. We find our data to be in good agreement with the results of very recent calculations, although intriguing subtleties remain.A high-quality 2D electron system under a small perpendicular magnetic field exhibits ballistic cyclotron motion. When the size of the cyclotron orbit is commensurate with an external one-dimensional (1D) density modulation, a series of longitudinal resistance minima are observed as a result of this geometric resonance condition. In a GaAs 2D electron system, such 1D density modulation can be achieved through the piezoelectric effect along the [110] and [-110] crystallographic directions. In the third part of this thesis, we discuss a technique that imposes a 1D magnetic modulation to the GaAs 2D electron system in the [100] and [010] crystallographic directions where the piezoelectric effect essentially zero. This technique can be implemented to study the geometric resonance of other 2D systems such as the AlAs 2D electron system, where the major axes of the carrier pockets are along the directions. By extending this technique to higher perpendicular magnetic fields, one can also add an additional tool to probe the physics of the composite fermion systems.
Book Synopsis Low-dimensional Interacting Electron Systems in a Magnetic Field by : Veikko Halonen
Download or read book Low-dimensional Interacting Electron Systems in a Magnetic Field written by Veikko Halonen and published by . This book was released on 1992 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spin-orbit Coupling Effects in Two-Dimensional Electron and Hole Systems by : Roland Winkler
Download or read book Spin-orbit Coupling Effects in Two-Dimensional Electron and Hole Systems written by Roland Winkler and published by Springer Science & Business Media. This book was released on 2003-10-10 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first part provides a general introduction to the electronic structure of quasi-two-dimensional systems with a particular focus on group-theoretical methods. The main part of the monograph is devoted to spin-orbit coupling phenomena at zero and nonzero magnetic fields. Throughout the book, the main focus is on a thorough discussion of the physical ideas and a detailed interpretation of the results. Accurate numerical calculations are complemented by simple and transparent analytical models that capture the important physics.
Book Synopsis Emerging Phenomena in Two-dimensional Electron System in Intermediate Magnetic Fields by : Sanghun An
Download or read book Emerging Phenomena in Two-dimensional Electron System in Intermediate Magnetic Fields written by Sanghun An and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The interlayer electron-electron interaction in bilayer two-dimensional electron system has been studied in tilted magnetic fields through electron drag measurements. In intermediate magnetic fields, where the temperature of electrons is comparable or larger than Landau level spacing, electrons near Fermi level can access more than one Landau level and inter-Landau level scatterings play an important role in transport properties of the system. In such a regime, we observed that the resonant 2k_F interlayer phonon exchange present in perpendicular magnetic fields is suppressed by moderate in-plane magnetic fields. Furthermore, in the absence of such resonant phonon exchange, the magneto-enhancement of drag is nearly temperature-independent and has a highly unusual B_perp^3 field dependence. We argue that the drastic suppression of 2k_F phonon exchange in tilted magnetic fields might be related to the substantial change in out-of-plane Lorentz force on electrons by in-plane component of fields during the 2k_F scattering process. We also argue that highly unusual temperature and field dependences of drag in tilted magnetic fields might be a consequence of fully-activated inter-Landau level scatterings, which are often neglected.
Book Synopsis Spin-orbit Coupling Effects in Two-Dimensional Electron and Hole Systems by : Roland Winkler
Download or read book Spin-orbit Coupling Effects in Two-Dimensional Electron and Hole Systems written by Roland Winkler and published by Springer. This book was released on 2003-10-06 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first part provides a general introduction to the electronic structure of quasi-two-dimensional systems with a particular focus on group-theoretical methods. The main part of the monograph is devoted to spin-orbit coupling phenomena at zero and nonzero magnetic fields. Throughout the book, the main focus is on a thorough discussion of the physical ideas and a detailed interpretation of the results. Accurate numerical calculations are complemented by simple and transparent analytical models that capture the important physics.
Book Synopsis Properties of Interacting Low-Dimensional Systems by : Godfrey Gumbs
Download or read book Properties of Interacting Low-Dimensional Systems written by Godfrey Gumbs and published by John Wiley & Sons. This book was released on 2013-03-27 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling the gap for comprehensive coverage of the realistic fundamentals and approaches needed to perform cutting-edge research on mesoscopic systems, this textbook allows advanced students to acquire and use the skills at a highly technical, research-qualifying level. Starting with a brief refresher to get all readers on an equal footing, the text moves on to a broad selection of advanced topics, backed by problems with solutions for use in classrooms as well as for self-study. Written by authors with research and teaching backgrounds from eminent institutions and based on a tried-and-tested lecture, this is a must-have for researchers, research students and instructors involved with semiconductor junctions, nanostructures and thin film systems.
Book Synopsis 3rd International Conference on Nanotechnologies and Biomedical Engineering by : Victor Sontea
Download or read book 3rd International Conference on Nanotechnologies and Biomedical Engineering written by Victor Sontea and published by Springer. This book was released on 2015-09-23 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the proceedings of the 3rd International Conference on Nanotechnologies and Biomedical Engineering which was held on September 23-26, 2015 in Chisinau, Republic of Moldova. ICNBME-2015 continues the series of International Conferences in the field of nanotechnologies and biomedical engineering. It aims at bringing together scientists and engineers dealing with fundamental and applied research for reporting on the latest theoretical developments and applications involved in the fields. Topics include Nanotechnologies and nanomaterials Plasmonics and metamaterials Bio-micro/nano technologies Biomaterials Biosensors and sensors systems Biomedical instrumentation Biomedical signal processing Biomedical imaging and image processing Molecular, cellular and tissue engineering Clinical engineering, health technology management and assessment; Health informatics, e-health and telemedicine Biomedical engineering education Nuclear and radiation safety and security Innovations and technology transfer
Book Synopsis Comprehensive Semiconductor Science and Technology by :
Download or read book Comprehensive Semiconductor Science and Technology written by and published by Newnes. This book was released on 2011-01-28 with total page 3572 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductors are at the heart of modern living. Almost everything we do, be it work, travel, communication, or entertainment, all depend on some feature of semiconductor technology. Comprehensive Semiconductor Science and Technology, Six Volume Set captures the breadth of this important field, and presents it in a single source to the large audience who study, make, and exploit semiconductors. Previous attempts at this achievement have been abbreviated, and have omitted important topics. Written and Edited by a truly international team of experts, this work delivers an objective yet cohesive global review of the semiconductor world. The work is divided into three sections. The first section is concerned with the fundamental physics of semiconductors, showing how the electronic features and the lattice dynamics change drastically when systems vary from bulk to a low-dimensional structure and further to a nanometer size. Throughout this section there is an emphasis on the full understanding of the underlying physics. The second section deals largely with the transformation of the conceptual framework of solid state physics into devices and systems which require the growth of extremely high purity, nearly defect-free bulk and epitaxial materials. The last section is devoted to exploitation of the knowledge described in the previous sections to highlight the spectrum of devices we see all around us. Provides a comprehensive global picture of the semiconductor world Each of the work's three sections presents a complete description of one aspect of the whole Written and Edited by a truly international team of experts
Book Synopsis High Magnetic Fields in Semiconductor Physics III by : Gottfried Landwehr
Download or read book High Magnetic Fields in Semiconductor Physics III written by Gottfried Landwehr and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 699 pages. Available in PDF, EPUB and Kindle. Book excerpt: High magnetic fields have, for a long time, been an important tool in the investigation of the electronic structure of semiconductors. In recent yearsstudies of heterostructures and superlattices have predominated, and this emphasis is reflected in these proceedings. The contributions concentrate on experiments using transport and optical methods, but recent theoretical developments are also covered. Special attention is paid to the quantum Hall effect, including the problem of edge currents, the influence of contacts, and Wigner condensation in the fractional quantum Hall effect regime. The 27 invited contributions by renowned expertsprovide an excellent survey of the field that is complemented by numerous contributed papers.
Book Synopsis Optical Properties of 2D Systems with Interacting Electrons by : Wolfgang J. Ossau
Download or read book Optical Properties of 2D Systems with Interacting Electrons written by Wolfgang J. Ossau and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, held in St. Petersburg, Russia, 13-16 June 2002
Book Synopsis Modern Perspectives In Many-body Physics: Proceedings Of The Sixth Physics Summer School by : Das Mukunda Prasad
Download or read book Modern Perspectives In Many-body Physics: Proceedings Of The Sixth Physics Summer School written by Das Mukunda Prasad and published by World Scientific. This book was released on 1994-05-18 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantum Theory Of The Optical And Electronic Properties Of Semiconductors (4th Edition) by : Stephan W Koch
Download or read book Quantum Theory Of The Optical And Electronic Properties Of Semiconductors (4th Edition) written by Stephan W Koch and published by World Scientific Publishing Company. This book was released on 2004-02-24 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This invaluable textbook presents the basic elements needed to understand and research into semiconductor physics. It deals with elementary excitations in bulk and low-dimensional semiconductors, including quantum wells, quantum wires and quantum dots. The basic principles underlying optical nonlinearities are developed, including excitonic and many-body plasma effects. Fundamentals of optical bistability, semiconductor lasers, femtosecond excitation, the optical Stark effect, the semiconductor photon echo, magneto-optic effects, as well as bulk and quantum-confined Franz-Keldysh effects, are covered. The material is presented in sufficient detail for graduate students and researchers with a general background in quantum mechanics.
Book Synopsis Advances in Solid State Physics by : Bernhard Kramer
Download or read book Advances in Solid State Physics written by Bernhard Kramer and published by Springer. This book was released on 2003-07-01 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2001 Spring Meeting of the 65th Deutsche Physikalische Gesellschaft was held together with the 65. Physikertagung, in Hamburg, during the pe riod March 26 30 2001. With more than 3500 conference attendees, a record has again been achieved after several years of stabilisation in participation. This proves the continuing and now even increasing, attraction of solid state physics, especially for young colleagues who often discuss for the first time their scientific results in public at this meeting. More than 2600 scientific pa pers were presented orally, as well as posters, among them about 120 invited lectures from Germany and from abroad. This Volume 41 of "Advances in Solid State Physics" contains the written versions of half of the latter. We nevertheless hope that the book truly reflects the current state of the field. Amazingly enough, the majority of the papers as well as the discussions at the meeting, concentrated on the nanostructured solid state. This re flects the currently extremely intensive quest for developing the electronic and magnetic device generations of the future, which stimulates science be sides the challenge of the unknown as has always been the case since the very beginning of Solid State Physics about 100 years ago.
Book Synopsis The Physics of Low-dimensional Structures by : Georgios P. Triberis
Download or read book The Physics of Low-dimensional Structures written by Georgios P. Triberis and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the field of low dimensional structures, starting from the selectively doped double heterostructures n-A1GaAs/GaAs/n-A1GaAs, and (strained) p-Si/SiGe/p-Si (quantum wells). The behaviour of the sheet electron density, the subband populations and energies as a function of the well width, the spacer thickness and the doping concentration is analysed. The temperature dependence of the bulk electron concentration versus the quasi-2DEG are discussed. In the framework of Boltzmann's transport theory a detailed study of the mobility is presented at low and high temperatures taking into account all the relevant scattering mechanisms. The pseudomorphic Si/SiGe undoped quantum wells are a perfect example for the study of the non-parabolicity of the hole-bands. For the first time in a book an exact solution of the multiband effective mass equation that describes the heavy, light and split-off hole valence bands is introduced, and interband transitions and selection rules are obtained. Reducing dimensionality new aspects concerning optical and transport properties of quantum wires (QWRS) is discussed. Specifically, the photoluminescence and the microphotoluminescence spectra of V-shaped QWRS is theoretically interpreted leading to a realistic cartography of the interface roughness of these systems. A computational approach for the solution of the eigenvalue problem in low-dimensional systems of complex but realistic geometry is also presented for the first time in a book, and transport theoretical considerations will lead to a systematic study of the mobility. As DNA could be considered as a one-dimensional "molecular wire" the study of carrier transport along DNA is discussed in terms of hopping transport. A computational scheme is presented which allows the study of near-field magnetoabsorpsion spectra of Quantum Dots (QD) of any given geometry, under magnetic field of any orientation. The effect of the spatial confinement imposed by the QD dimensions and the magnetic confinement governed by the magnetic field are explored. The influence of the Coulomb interactions between electrons and holes is also discussed. The applicability of the method in actual experiments, i.e. the illumination of a nanostructure with a near-field probe in conjunction with the simultaneous application of an external magnetic field, may become a challenge to experimentalists. Finally, magnetothermoelectic transport in the fractional quantum Hall effect (FQHE) regime is discussed. The theoretical framework for the calculation of the resistivity, the thermopower and the thermal conductivity for two-dimensional electron and hole gases, at low temperatures and strong perpendicular magnetic fields is outlined. The composite fermion picture enables the use of the integer quantum Hall effect and Shubnikov - de Haas conductivity models for a quantitative comparison with experiment. A study on the validity of fundamental physical laws such as the Wiedemann-Franz law in two-dimensional structures is also presented.
Book Synopsis The Spectroscopy of Semiconductors by :
Download or read book The Spectroscopy of Semiconductors written by and published by Academic Press. This book was released on 1992-07-31 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectroscopic techniques are among the most powerful characterization methods used to study semiconductors. This volume presents reviews of a number of major spectroscopic techniques used to investigate bulk and artificially structured semiconductors including: photoluminescence, photo-reflectance, inelastic light scattering, magneto-optics, ultrafast work, piezo-spectroscopy methods, and spectroscopy at extremely low temperatures and high magnetic fields. Emphasis is given to major semiconductor systems, and artificially structured materials such as GaAs, InSb, Hg1-xCdxTe and MBE grown structures based upon GaAs/AlGaAs materials. Both the spectroscopic novice and the expert will benefit from the descriptions and discussions of the methods, principles, and applications relevant to today's semiconductor structures. Key Features* Discusses the latest advances in spectroscopic techniques used to investigate bulk and artificially structured semiconductors* Features detailed review articles which cover basic principles* Highlights specific applications such as the use of laser spectroscopy for the characterization of GaAs quantum well structures
Book Synopsis Physics of Long-Range Interacting Systems by : A. Campa
Download or read book Physics of Long-Range Interacting Systems written by A. Campa and published by OUP Oxford. This book was released on 2014-08-28 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with an important class of many-body systems: those where the interaction potential decays slowly for large inter-particle distances; in particular, systems where the decay is slower than the inverse inter-particle distance raised to the dimension of the embedding space. Gravitational and Coulomb interactions are the most prominent examples, however it has become clear that long-range interactions are more common than previously thought. A satisfactory understanding of properties, generally considered as oddities only a couple of decades ago, has now been reached: ensemble inequivalence, negative specific heat, negative susceptibility, ergodicity breaking, out-of-equilibrium quasi-stationary-states, anomalous diffusion. The book, intended for Master and PhD students, tries to gradually acquaint the reader with the subject. The first two parts describe the theoretical and computational instruments needed to address the study of both equilibrium and dynamical properties of systems subject to long-range forces. The third part of the book is devoted to applications of such techniques to the most relevant examples of long-range systems.
Download or read book Chinese Journal of Physics written by and published by . This book was released on 1998 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
