T型双量子点分子Aharonov-Bohm干涉仪的电输运

Electron transport through T-shaped double quantum dot molecule Aharonov-Bohm interferometer

利用非平衡格林函数方法,理论研究T型双量子点分子Aharonov-Bohm(A-B)干涉仪的电荷及其自旋输运性质.通过控制T型双量子点分子内量子点间有无耦合,能够实现在同一电子能级位置处分别出现共振和反共振状态,根据此性质,能将体系设计成量子开关器件.当将两个完全相同的T型双量子点分子分别嵌入A-B干涉仪两臂中时,磁通取适当数值,能够出现完全的量子相消干涉.通过调节量子点能级、左右两电极间的偏压和Rashba自旋轨道相互作用强度,可对体系自旋流进行调控.

Using non-equilibrium Green’s function method, the charge and spin transport properties through T-shape double quantum dot molecule Aharonov-Bohm （A-B） interference are theoretically investigated. Resonance or anti-resonance can occur at the same location in conductance spectrum by controlling coupling or uncoupling between two quantum dots in T-shape double quantum dot molecule, which is the basis for designing quantum switches. When two identical T-shaped double quantum dot molecules are embedded in two arms of A-B interferometer, respectively, totally destructive interference can appear by taking appropriate magnetic flux. Spin current through the system can be regulated by adjusting quantum dot level, bias between two electrodes and Rashba spin-orbit interaction.