Download or read book Breakdown of the Quantum Hall Effect in InGaAs InP Quantum Wells written by Victor Yu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The quantum Hall effect occurs in a two-dimensional electron gas confined in a quantum well when subjected to a high perpendicular magnetic field. By passing a sufficiently high current through a Hall bar, the quantum Hall effect can be destroyed. A rich variety of non-linear phenomena can be accessed at and beyond current-induced quantum Hall breakdown. One example is hysteresis arising from dynamic nuclear polarization through the interplay of electron and nuclear spins via the hyperfine interaction. Another example is electric instability leading to resistance fluctuations and negative differential resistance. These phenomena are typically observed in widely studied GaAs/AlGaAs heterostructure quantum well Hall bar devices. We report on the characteristics of hysteresis and electric instability seen at and beyond quantum Hall breakdown in InGaAs/InP quantum well Hall bar devices. Such indium-based quantum wells are of current interest for spintronic applications. As compared to widely employed GaAs/AlGaAs quantum wells, InGaAs/InP quantum wells offer larger electron g-factors, stronger spin-orbit coupling, and the nuclear spin for indium (9/2) is larger than for gallium (3/2). We investigate non-linear magnetotransport in three long (200-300 um) and narrow (15 um) Hall bar devices made from a strained InGaAs/InP quantum well and can change the electron sheet density by careful illumination. Two-dimensional maps of voltage or resistance as a function of current and magnetic field are generated. These maps may be regarded as phase diagrams since they provide a wealth of information about the conditions for quantum Hall breakdown, hysteresis, electric instability, and a number of other phenomena. We document extensively how the quantum Hall breakdown and non-linear phenomena evolve systematically not only with increasing magnetic field but also with increasing electron sheet density. Regarding the hysteresis, we find that it is pronounced when spin-polarized quantum Hall states break down. The hysteresis is accompanied by slow change of measured signal on timescales of a few minutes or even a few hours. We examine whether the observed hysteresis and time dependent behaviour are consistent with a picture of dynamic nuclear polarization or if it has its origin elsewhere. Regarding the electric instability, it becomes prevalent at high current over a wide range of magnetic field at high electron sheet density when the differential resistance along the Hall bar device approaches zero or becomes negative. Our observations may provide insight into the formation of domains within the Hall bar that carry different currents, and turbulent electron flow." --
Download or read book Fractional Quantum Hall Effect in Wide Quantum Wells written by Javad Shabani and published by . This book was released on 2011 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Perspectives in Quantum Hall Effects written by Sankar Das Sarma and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of the quantized and fractional Quantum Hall Effect phenomena is among the most important physics findings in the latter half of this century. The precise quantization of the electrical resistance involved in the quantized Hall effect phenomena has led to the new definition of the resistance standard and has metrologically affected all of science and technology. This resource consists of contributions from the top researchers in the field who present recent experimental and theoretical developments. Each chapter is self-contained and includes its own set of references guiding readers to original papers and further reading on the topic.
Download or read book Quantum Hall Effect written by A. H. MacDonald and published by Jaca Book. This book was released on 1989 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Quantum Hall Effect written by Richard E. Prange and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: After a foreword by Klaus von Klitzing, the first chapters of this book discuss the prehistory and the theoretical basis as well as the implications of the discovery of the Quantum Hall effect on superconductivity, superfluidity, and metrology, including experimentation. The second half of this volume is concerned with the theory of and experiments on the many body problem posed by fractional effect. Specific unsolved problems are mentioned throughout the book and a summary is made in the final chapter. The quantum Hall effect was discovered on about the hundredth anniversary of Hall's original work, and the finding was announced in 1980 by von Klitzing, Dorda and Pepper. Klaus von KIitzing was awarded the 1985 Nobel prize in physics for this discovery.
Download or read book Properties of III V Quantum Wells and Superlattices written by P. K. Bhattacharya and published by IET. This book was released on 1996 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: A finely-structured, state-of-the-art review on controlled building of atomic-scale mutilayers, where nanometric structures based on III-V semiconductors have attracted particular attention.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantized Hall Effect in Single Quantum Wells of InAs written by E. E. Mendez and published by . This book was released on 1984 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics of Semiconductors in High Magnetic Fields written by Noboru Miura and published by Oxford University Press. This book was released on 2008 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes most of the fundamental physical phenomena which semiconductors and their modulated structures exhibit in high magnetic fields. Readers can learn not only the basic theoretical background but also the present state of the art from the most advanced data in this rapidly growing research area.
Download or read book Synthetic Modulated Structures written by Leroy L. Chang and published by Elsevier. This book was released on 2013-10-22 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Science and Technology Series: Synthetic Modulated Structures focuses on synthetic modulated structures, which is described as any periodically perturbed materials with a repetition greater than the basic unit cell dimension. The book is organized into three parts. Part I provides a perspective of developments and structural characterization of the semiconductor and metal area. The electronic properties in different configurations and structures, including compositional and doping modulation are covered in Part II. Part III begins with preparation methods, followed by a discussion on distinctive fields of interest in metals, transport and magnetic properties, superconductivity, and diffusion. This publication is a good source for students and researchers conducting work in the general area of modulated structures.
Download or read book Interfaces Quantum Wells and Superlattices written by C. Richard Leavens and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NATO Advanced Study Institute on "Interfaces, Quantum Wells and Superlattices" was held from August 16th to 29th, 1987, in Banff, Alberta, Canada. This volume contains most of the lectures that were given at the Institute. A few of the lectures had already been presented at an earlier meeting and appear instead in the proceedings of the NATO Advanced Study Institute on "Physics and Applications of Quantum Wells and Super lattices" held in Erice from April 21st to May 1st earlier in the year and published by Plenum Press. The study of semiconductor interfaces, quantum wells and super lattices has come to represent a substantial proportion of all work in condensed matter physics. In a sense the growth of interest in this area, which began to accelerate about 10 years ago and seems to be continuing, has been driven by technological developments. While the older generation of semiconductor devices was based on adjacent semiconductors with different properties (e. g. different doping levels) separated by interfaces, modern semiconductor devices tend to be based more and more on properties of the interfaces themselves. This has led, as an example, to the field of band-structure engineering. Improved understanding of the fundamental physics of these systems has aided technological developments and, in turn, technological developments have made available systems which exhibit novel and fascinating phYSical properties, such as the integer and fractional quantum Hall effects.
Download or read book Long Wavelength Infrared Emitters Based on Quantum Wells and Superlattices written by Manfred Helm and published by CRC Press. This book was released on 2000-10-31 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a thorough survey of long wavelength infrared semiconductor emitters based primarily on quantum wells and superlattices. Featuring contributions from the most prominent researchers in the field, this volume allows readers to compare different types of lasers as well as examine investigations of potential far-infrared/terrahertz sources. This is an essential reference for researchers, engineers and graduate students who wish to obtain comprehensive knowledge about infrared semiconductor sources and recent developments in this field.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Nanodevices and Nanofabrication written by Qing Zhang and published by CRC Press. This book was released on 2012-07-17 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variety of devices at nanometer/molecular scale for electronic, photonic, optoelectronic, biological, and mechanical applications have been created through the rapid development of materials and fabrication technology. Further development of nanodevices strongly depends on the state-of-the-art knowledge of science and technology at the sub-100 nm
Download or read book Physics and Applications of Quantum Wells and Superlattices written by E.E. Mendez and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the lectures delivered at the NATO Advanced Study Institute on "Physics and Applications of Quantum Wells and Superlattices", held in Erice, Italy, on April 21-May 1, 1987. This course was the fourth one of the International School of Solid-State Device Research, which is under the auspices of the Ettore Majorana Center for Scientific Culture. In the last ten years, we have seen an enormous increase in re search in the field of Semiconductor Heterostructures, as evidenced by the large percentage of papers presented in recent international conferences on semiconductor physics. Undoubtfully, this expansion has been made possible by dramatic advances in materials preparation, mostly by molecular beam epitaxy and organometallic chemical vapor deposition. The emphasis on epitaxial growth that was prevalent at the beginning of the decade (thus, the second course of the School, held in 1983, was devoted to Molecular Beam Epitaxy and Heterostructures) has given way to a strong interest in new physical phenomena and new material structures, and to practical applications that are already emerging from them.
Download or read book Modern Semiconductor Quantum Physics written by Ming Fu Li and published by World Scientific. This book was released on 1995-02-28 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Semiconductor Quantum Physics has the following constituents: (1) energy band theory: pseudopotential method (empirical and ab initio); density functional theory; quasi-particles; LCAO method; k.p method; spin-orbit splitting; effect mass and Luttinger parameters; strain effects and deformation potentials; temperature effects. (2) Optical properties: absorption and exciton effect; modulation spectroscopy; photo luminescence and photo luminescence excitation; Raman scattering and polaritons; photoionization. (3) Defects and Impurities: effective mass theory and shallow impurity states; deep state cluster method, super cell method,Green's function method; carrier recombination kinetics; trapping transient measurements; electron spin resonance; electron lattice interaction and lattice relaxation effects; multi-phonon nonradiative recombination; negative U center, DX center and EL2 Defects. (4) Semiconductor surfaces: two dimensional periodicity and surface reconstruction; surface electronic states; photo-electron spectroscopy; LEED, STM and other experimental methods. (5) Low-dimensional structures: Heterojunctions, quantum wells; superlattices, quantum-confined Stark effect and Wannier-Stark ladder effects; resonant tunneling, quantum Hall effect, quantum wires and quantum dots.This book can be used as an advanced textbook on semiconductor physics for graduate students in physics and electrical engineering departments. It is also useful as a research reference for solid state scientists and semiconductor device engineers.
Download or read book Physical Concepts of Materials for Novel Optoelectronic Device Applications II written by and published by . This book was released on 1991 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
