Effects of decoherence and Rashba-type spin-orbit interaction on quantum transport in mesoscopic structure

• Main Author: 簡靖航
• Other Authors: 朱仲夏
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/53709899417967440113

碩士 === 國立交通大學 === 電子物理系所 === 94 === In many researches, the scale of system is much smaller then coherent length. So it neglect the de-phase process due to electron scattering. We use custom method to induce numerical de-phase process in 1-D case to solve 2-D problem through considering sub-band mixing. Observe de-coherent strength how to influence the conductance of double quantum point contacts (QPCs) in series. Next, we consider an open quantum dot connected via two narrow constriction (NC) to the source and drain electrode. The NC has both Dresselhaus and Rashba spin-orbit interaction while the open quantum dot has only Rashba (SOI). Effects of the dot configuration and the SOI coupling constants on the spin-dependent characteristics will be studied.