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

Author: ZhaoHua
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: O481
Type: Master's thesis
Year: 2007
Downloads: 120
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Abstract


Electron transport in quantum wires ( nanowires ) , quantum dots and mesoscopic systems has been a concern of the people , it is not only an important underlying physical problem , but also has the potential of high-tech applications background . Mesoscopic systems such as quantum wires and quantum dots is an important physical devices of the future nano quantum circuit . With the rapid development of laser technology , laser -matter interactions 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 . Keldysh nonequilibrium Green function method , the effective mass of the free electron model based on research with transport properties in the case of spin-orbit coupling the semiconductor heterojunction quantum wire laser field to get some meaningful 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 . Chapter II described from band theory angle the semiconductor heterojunction formation as well as quantum wells , quantum wires and quantum dots prepared and intended use ; types of semiconductor heterojunction spin-orbit coupling . 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 . The NEGF equations of motion to study the two-level quantum wire with spin -orbit coupling in the electronic transport properties under the irradiation of the laser field . When the laser field along the longitudinal polarization , the spin polarization conductance curves showing the band structure next obvious photons , when the frequency of the external field and the spin-orbit coupling strength to take the appropriate value , can increase the rate of spin-polarized and change the output of the system Win characteristics . Paper, the qualitative and quantitative analysis of the physical mechanism of the formation of these phenomena . 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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