Home Newsletter
News Books
Welcome to FreeScience.info Language/Lingua

Books 3054
· Book News
· Most clicked
· Least clicked

Search for a Book
Add a new Book

Theory of Spin Hall Effects in Semiconductors

Author: Hans-Andreas Engel, Emmanuel I. Rashba, Bertrand
Url: http://arxiv.org/abs/cond-mat/0603306
Format: Pdf
Year: 2006
Category: Quantum magnetism
Pages: 37
Clicks: 2095

Spin Hall effects are a collection of phenomena, resulting from spin-orbit coupling, in which an electrical current flowing through a sample can lead to spin transport in a perpendicular direction and spin accumulation at lateral boundaries. These effects, which do not require an applied magnetic field, can originate in a variety of intrinsic and extrinsic spin-orbit coupling mechanisms and depend on geometry, dimension, impurity scattering, and carrier density of the system--making the analysis of these effects a diverse field of research. In this article, we give an overview of the theoretical background of the spin Hall effects and summarize some of the most important results. First, we explain effective spin-orbit Hamiltonians, how they arise from band structure, and how they can be understood from symmetry considerations; including intrinsic coupling due to bulk inversion or structure asymmetry or due to strain, and extrinsic coupling due to impurities. This leads to different mechanisms of spin transport: spin precession, skew scattering, and side jump. Then we present the kinetic (Boltzmann) equations, which describe the spin-dependent distribution function of charge carriers, and the diffusion equation for spin polarization density. Next, we define the notion of spin currents and discuss their relation to spin polarization. Finally, we explain the electrically induced spin effects; namely, spin polarization and currents in bulk and near boundaries (the focus of most current theoretical research efforts), and spin injection, as well as effects in mesoscopic systems and in edge states.

Similar Books
Paradosso EPR e teorema di Bell
Quantum magnets: a brief overview
Berry phase effects in magnetism
Heavy Fermions: electrons at the edge of magnetisms
Quantum Antiferromagnets in Two Dimensions
Critical Dynamics of Magnets
Frustrated Quantum Magnets
Colossal magnetoresistant materials
Strongly Disordered Quantum Spin Systems in Low Dimensions
Optical Metamagnetism and Negative Index Metamaterials
Spin Ice
Variational wave functions for frustrated magnetic models
Quantum magnetism (Graduate lectures)
Theory of Orbital Magnetization in Solids
Lecture notes on Nanomagnetism

Home |  Authors | About | Contact Us |  Email 
 Copyright © 2002-2013 FreeScience.info. 

Best viewed with Mozilla 1.X 1024x768
free scientific books