Rashba Spin Orbit Interaction In Low And High Magnetic Fields PDF Books

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Rashba Spin Orbit Interaction In Low And High Magnetic Fields

Rashba Spin Orbit Interaction In Low And High Magnetic Fields
Author: Christopher Schierholz
Publisher: Cuvillier Verlag
ISBN: 3865374492
Size: 48.91 MB
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Rashba Spin-orbit Interaction in Low and High Magnetic Fields
Language: en
Pages: 90
Authors: Christopher Schierholz
Categories:
Type: BOOK - Published: 2005 - Publisher: Cuvillier Verlag
Books about Rashba Spin-orbit Interaction in Low and High Magnetic Fields
Rashba Spin-Orbit Interaction in Low and High Magnetic Fields
Language: de
Pages: 102
Authors: Christopher Schierholz
Categories: Science
Type: BOOK - Published: 2005-05-19 - Publisher: Cuvillier Verlag
In dieser Arbeit wird die Rashba Spin-Bahn Wechselwirkung in zweidimensionalen Elektronengasen(2DEG) von III-V Schmalbandhalbleitern untersucht. Hauptursache der Spin-Bahn Wechselwirkung ist in diesen Halbleitern Strukturinversionsasymmetrie, deren Stärke durch den Rashba Parameter a beschrieben wird. Die Potentialgradienten senkrecht zum 2DEG und die Grenzflächen tragen zu a bei. In dieser Arbeit werden drei Messmethoden verwendet, um a zu bestimmen: Shubnikov-de Haas (SdH) Oszillationen in starken äußeren Magnetfeldern und Schwache Antilokalisierung (WAL) sowie Al’tshuler-Aronov-Spivak (AAS) Oszillationen in kleinen externen Magnetfeldern. Die Stärke von a wird durch Anlegen von Gatespannungen geregelt. Messungen an Inversionsschichten von p-Typ InAs Einkristallen sowie an InAs/In0.75Ga0.25As Heterostrukturen zeigen SdH Oszillationen und WAL.
Magnetoresistance of mesoscopic metallic spin-valve devices
Language: en
Pages: 76
Authors: Alexander van Staa
Categories: Science
Type: BOOK - Published: 2006-08-29 - Publisher: Cuvillier Verlag
Spin-polarized transport in all-metal spin-valve devices consisting of two bar-shaped permalloy electrodes and an interconnecting aluminum strip are studied in this thesis. Two different geometries are realized: one has a planar aluminum strip, the other has planar permalloy electrodes. The anisotropic magnetoresistance of the electrodes and the magnetoresistance of the entire device are measured in the same cooling cycles at liquid helium temperatures and above. The mesoscopic spin-valve effect is observed in samples with both layouts. The spin-valve effect can be clearly distinguished from parasitic effects, namely the anisotropic magnetoresistance and the local Hall effect. The magnitude of the spin-valve effect and its temperature dependence show good agreement with a theoretical estimation based on diffusive transport. The micromagnetic behavior of the permalloy electrodes is explored with a magnetic-force microscope at room temperature and with measurements of the anisotropic magnetoresistance at low temperatures. Tunnel barriers at the interfaces between the ferromagnets and the normal metal are predicted to increase the spin-injection efficiency. Therefore, the natural oxidation of aluminum in pure oxygen is studied with non-magnetic tunnel junctions. Aluminum oxide tunnel barriers are fabricated successfully both in an evaporation chamber and in a multi-target sputter-deposition system. The latter enables the in situ
Deutsche Nationalbibliografie
Language: de
Pages:
Authors: Alexander van Staa
Categories: German imprints
Type: BOOK - Published: 2005-07 - Publisher:
Books about Deutsche Nationalbibliografie
Deutsche Nationalbibliographie und Bibliographie der im Ausland erschienenen deutschsprachigen Veröffentlichungen
Language: de
Pages:
Authors: Alexander van Staa
Categories: Dissertations, Academic
Type: BOOK - Published: 2005 - Publisher:
Books about Deutsche Nationalbibliographie und Bibliographie der im Ausland erschienenen deutschsprachigen Veröffentlichungen
Interplay of spins, charges and photons in low-dimensional systems
Language: de
Pages: 194
Authors: Alexander van Staa
Categories: Science
Type: BOOK - Published: 2005-02-16 - Publisher: Cuvillier Verlag
This Habilitationsschrift is based on 20 selected papers published/submitted after I joined the University of Hamburg on September 2, 1999, which include 2 invited ones, 16 others published in Physical Review Letters, Europhysics Letters, Physical Review B, Applied Physics Letters, and 2 preprints. Three papers on spintronics are based on experiments performed before I joined the Universität Hamburg. Writing the work provides me a chance to look back over my past five and a half year’s academic life in Hamburg, where I have enjoyed and appreciated the hospitality of my colleagues in the Institut für Angewandte Physik of Universität Hamburg. The Habilitationsschrift begins with this general introduction followed by a list of papers on three seemingly different topics: spintronics, photoconductivity, and the bilayer two-dimensional electron system. The work covers three different materials, namely semiconductors, ferromagnetic metals, and their hybrid samples. They are experimentally investigated by three different techniques: magneto- and spin-dependent transport, far-infrared transmission spectroscopy, as well as microwave and infrared photoconductivity spectroscopy. Cross thinking of different systems vs various techniques has been a convenient source of developing new ideas for performing experiments. At the heart of the topics which I have been absorbed over the years is the interplay
High Magnetic Fields in Semiconductor Physics
Language: en
Pages: 444
Authors: Yong-Jie Wang, Lloyd Engel, Nicholas Bonesteel
Categories: Science
Type: BOOK - Published: 2005-05-03 - Publisher: World Scientific
This comprehensive volume covers the latest research on high magnetic fields in semiconductor physics presented at the 16th International Conference (SemiMag 16), held in Tallahassee, Florida, August 2–8, 2004. The book features papers from more than 130 participants including the work of the foremost experts in the fields. Much of the most cutting-edge research is covered by the contributions as well as a special focused session on the recently discovered microwave-induced zero resistance effect. Contents:Microwave Induced Zero Resistance EffectNanotubes and Aharonov-Bohm EffectFractional Quantum Hall EffectInteger Quantum Hall EffectGeneral TransportCoupled SystemsMagnetic and II-VI SemiconductorsMagneto-OpticsSpin and Phonon Excitations Readership: Academics at institutes and universities that conduct high magnetic field research in semiconductor physics, professionals in industrial companies and graduate students. Keywords:High Magnetic Fields;Semiconductor Physics;International Conference;NHMFL;Tallahassee
Spin-Polarized Currents for Spintronic Devices: Point-Contact Andreev Reflection and Spin Filters
Language: en
Pages: 132
Authors: Sebastian von Oehsen
Categories: Science
Type: BOOK - Published: 2007-11-30 - Publisher: Cuvillier Verlag
The emerging field of spintronics deals with the control and manipulation of the spin of the elec¬trons rather than the charge. The first chapter of this thesis gives an overview of the areas of research in spintronics and puts the goals of the present work into the perspective of the work on spintronic devices. Amongst others, the generation of highly spin-polarized currents, i.e., currents with a nonequilibrium spin population, is of high importance for spintronics. In this thesis two different approaches to the generation of spin-polarized currents are investigated. In the second chapter the ferromagnetic Heusler alloy Ni2MnIn is investigated. It is a candidate as a half-metallic spin-injector. We use point-contact Andreev reflection as a method to determine the spin polariza¬tion of thin films of Ni2MnIn. A detailed description of the theoretical basics of the method is given. The setup for this technique has been optimized within this work. Measurements are per¬formed on Au, Ni, and Ni2MnIn films. The experimental data is analyzed using three different the¬oretical models. Chapter 3 deals with an alternative approach to generate spin-polarized currents: the realization of a full-semiconductor spin filter. In such a device the spin polarization originates from the spin-orbit interaction in the
Spin-orbit Coupling Effects in Two-Dimensional Electron and Hole Systems
Language: en
Pages: 228
Authors: Roland Winkler
Categories: Technology & Engineering
Type: BOOK - Published: 2003-10-10 - Publisher: Springer Science & Business Media
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.
Spin Physics in Semiconductors
Language: en
Pages: 442
Authors: Mikhail I. Dyakonov
Categories: Science
Type: BOOK - Published: 2008-07-18 - Publisher: Springer Science & Business Media
The purpose of this collective book is to present a non-exhaustive survey of sp- related phenomena in semiconductors with a focus on recent research. In some sense it may be regarded as an updated version of theOpticalOrientation book, which was entirely devoted to spin physics in bulk semiconductors. During the 24 years that have elapsed, we have witnessed, on the one hand, an extraordinary development in the wonderful semiconductor physics in two dim- sions with the accompanying revolutionary applications. On the other hand, during the last maybe 15 years there was a strong revival in the interest in spin phen- ena, in particular in low-dimensional semiconductor structures. While in the 1970s and 1980s the entire world population of researchers in the ?eld never exceeded 20 persons, now it can be counted by the hundreds and the number of publications by the thousands. This explosive growth is stimulated, to a large extent, by the hopes that the electron and/or nuclear spins in a semiconductor will help to accomplish the dream of factorizing large numbers by quantum computing and eventually to develop a new spin-based electronics, or “spintronics”. Whether any of this will happen or not, still remains to be seen. Anyway,