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Electron Transport Properties of a Quantum Wire with Spin-Orbit Coupling under Laser Field Irradiation

Author: LiaoWenHu
Tutor: ZhouGuangHui
School: Hunan Normal University
Course: Condensed Matter Physics
Keywords: Semiconductor heterojunction Quantum line Spin-orbit coupling Laser field NEGF Mesoscopic transient transport
CLC: O471.1
Type: Master's thesis
Year: 2006
Downloads: 264
Quote: 1
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Abstract


Electron transport in quantum wires (nanowires), quantum dots and mesoscopic systems has been a concern of the people. Not only because it is an important underlying physical problem, and has a potential high-tech background, quantum wires and quantum dots mesoscopic systems is an important physical devices of the future nano quantum circuit. With the rapid development of laser technology, laser-matter interaction has become an important scientific problems, especially the issue of the impact of the laser on the electronic transport properties of mesoscopic systems has aroused great interest. The effective mass of the free electron model based on the Keldysh non-equilibrium Green's function method to study the the semiconductor heterojunction quantum wire laser fields contain the electronic structure and transport properties of the spin-orbit coupling case, get some meaningful The new results. The text is divided into five chapters. The first chapter briefly describes the history and status quo of the electron spin-orbit coupling in the flash blende structure compound semiconductor heterostructure (quantum well) Artificial Microstructure, including the accumulation of spin, spin precession, spin pump effect spin filter, spin-polarized transport and spin current and spin Hall effect. The second chapter describes the formation of the semiconductor heterostructure and quantum well, quantum wire and quantum dots prepared and intended use from energy band theory angle; electron spin-orbit coupling in semiconductor heterojunction type. The third chapter describes the non-equilibrium Green's function method and its application in mesoscopic transport, widely used equations of motion as well as the current formula is derived. The fourth chapter mainly our own work. Use of the the NEGF equations of motion method to study the resonance (ie the frequency of the quantum wire horizontal sub-level spacing match) laser field irradiated by the electron transport properties of quantum wires. Presented in the appropriate interaction electron - photon intensity in the case of excluding the spin-orbit coupling, when the laser field along the longitudinal polarization the negative conductance interesting phenomenon; system conductance rendered symmetrical distribution when the laser field along the transverse polarization, peak structure. Transport properties when the field frequency Ω and the spin-orbit coupling the strength k_R take the appropriate value when taking into account the spin-orbit coupling, horizontal polarized laser field irradiation can improve the rate of spin polarization and change the system. The physical mechanism of these phenomena in a qualitative and quantitative analysis and discussion. Chapter V we review and summarize the work of this paper 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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