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Theory of spin transport in spin-orbit coupling systems
2015-05-13     作者:      来源:       浏览次数:1825
报告题目:Theory of spin transport in spin-orbit coupling systems
报  告 人:Mansoor Bin Abdul Jalil  Associate Professor (National University of Singapore)
报告时间:2015年05月18日(周一)上午10: 30-11:30
报告地点:南校区双超楼211报告室


Title: Theory of spin transport in spin-orbit coupling systems     

 

Abstract: We theoretically investigated the generation of spin current and spin polarization in spin-orbit coupling (SOC) systems. First, we studied the spin transport in a time-dependent Rashba system, where the Rashba coupling is modulated by an AC gate voltage. At high Rashba frequency, we showed that the electron spin polarization can be rectified. As a consequence, the Zitterbewegung of electron wave packet in such system can be kept persistent, which is significant for the experimental observation.  In addition, by combining time-dependent Rashba and Dresselhaus SOCs, we proposed a method to generate spin current that is sustainable in disordered systems. Moreover, in ballistic limit, such systems can be utilized as a source for spin pumping. In the next part of the thesis, we unified the description of spin Hall effects in a wide class of SOC systems by using spin force picture, which reproduced the spin Hall conductivity obtained previously via Kubo's linear response approach.

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