Spin-polarization-dependent transport in a quantum dot array coupled with an Aharonov-Bohm ring  

作　　者：王瑞 孔令民 周运清 张存喜 邢志勇 

机构地区：[1]Department of Physics,Zhejiang Ocean University [2]Xiamen Ocean Vocational College

出　　处：《Chinese Physics B》2010年第12期443-450,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 10947163 and 10947164)

摘　　要：In this paper the quantum transport in a dot-array coupled with an Ahaxonov-Bohm （AB） ring is investigated via single-band tight-binding Hamiltonian. It is shown that the output spin current is a periodic function of the magnetic flux in the quantum unit Ф0. The resonance positions of the total transmission probability do not depend on the size of the AB ring but the electronic spectrum. Moreover, the persistent currents in the AB ring is also spin-polarization dependent and different from the isolated AB ring where the persistent current is independent of spin polarization.In this paper the quantum transport in a dot-array coupled with an Ahaxonov-Bohm （AB） ring is investigated via single-band tight-binding Hamiltonian. It is shown that the output spin current is a periodic function of the magnetic flux in the quantum unit Ф0. The resonance positions of the total transmission probability do not depend on the size of the AB ring but the electronic spectrum. Moreover, the persistent currents in the AB ring is also spin-polarization dependent and different from the isolated AB ring where the persistent current is independent of spin polarization.

关 键 词：SPIN-POLARIZATION TRANSMISSION AB ring CURRENT 

分 类 号：O471.1[理学—半导体物理] TN6[理学—物理]