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The Influence of Spin-Orbit Coupling on Electron Transport Properties for an Semiconductor Quantum Wire

Author: LiuGenHua
Tutor: ZhouGuangHui
School: Hunan Normal University
Course: Condensed Matter Physics
Keywords: Spintronics Semiconductor heterojunction Quantum line Spin-orbit coupling Spin polarized transport Scattering matrix
CLC: O471.1
Type: Master's thesis
Year: 2006
Downloads: 173
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Abstract


Spintronics is to study the use of the electronic properties of the spin information storage , processing and transmission of science , are a popular branch of nanoelectronics . Based semiconductor heterostructure with spin-orbit coupling of the transport problem has increasingly become a hot area of ??research , especially in the absence of an external magnetic field , and control the spin of the electron in the design spin injection devices and spin sieve it is very important . Based semiconductor heterojunction mesoscopic systems ( artificial low-dimensional quantum structures) , such as quantum wires and quantum dots will be an important part of nanometer circuits . Therefore, the study of transport properties of the spin-orbit coupling quantum wire very important basis of the significance and high-tech applications background . In this paper, the effective mass of the free electron model , under the framework of the Landauer-Büttiker scattering matrix method to study the electronic transport properties of the Rashba spin-orbit coupling quantum wire connection two normal conductor electrode system , get some meaningful results . The text is divided into four chapters . First and second chapter briefly introduce flash blende structure semiconductor and heterojunction electron spin -orbit coupling origin of spin-polarized transport impact study the history and status quo , including the type of spin-orbit coupling and The physical origin of the spin accumulation , spin precession , spin intensification of transport as well as the spin current Hall effect . In our own work in the third chapter , we systematically study a both ends connected to a normal conductor electrode itself contains the electronic transport properties of the Rashba spin-orbit coupling quantum wire system . Free electron approximation , the scattering matrix method , through analytic and numerical calculation , found that at the same time with spin-orbit coupling and non-adiabatic electrode - quantum wire coupled system presents scores conductance and in some special size since characteristics of the spin -polarized current . Based on this characteristic , we can find a case without outfield spin-polarized current , and you can use it to design a spin sieve . Chapter this work a brief summary , and gave a brief outlook on the prospects for the development of this field of research .

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CLC: > Mathematical sciences and chemical > Physics > Semiconductor physics > Semiconductive Theory > Semiconductor quantum theory
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