含双δ势垒三臂量子环的透射概率和持续电流  

Tunneling coefficient and persistent current in triple-arm quantum ring with double δ barrier

作　　者：杜坚[1] 王素新[1] 杨淑敏[1] 

机构地区：[1]承德民族师范高等专科学校物理系,承德067000

出　　处：《物理学报》2009年第11期7926-7933,共8页Acta Physica Sinica

基　　金：河北省教育厅自然科学研究指导项目(批准号:Z2008103)资助的课题~~

摘　　要：研究了含双δ势垒三臂量子环的透射概率和持续电流,研究结果表明:透射概率和持续电流都随半导体环尺寸的增大发生振荡,透射概率和持续电流与电子自旋和铁磁电极磁矩的取向相关.量子环尺寸取固定值时,透射概率和持续电流都会随AB磁通的增加发生周期性等幅振荡.δ势垒和Rashba自旋轨道耦合对透射概率或持续电流有着不同的影响.In this paper tunneling coefficient and persistent current in triple-arm quantum ring with double δ barrier is investigated. The results show that the tunneling coefficient and persistent current show oscillating behavior with the length of the semiconductor quantum ring increasing. The tunneling coefficient and persistent current depend not only on spin orientation of tunneling electrons but also on the ferromagnetic magnetization direction. When the size of the quantum ring is fixed, the tunneling coefficient and persistent current will generate isochronal oscillation with the increasing of the AB magnetic flux. Furthermore, δ barrier and Rashba spin-orbit interaction have different effect on the properties of the tunneling coefficient and persistent current.

关 键 词：透射概率 持续电流 RASHBA自旋轨道耦合 δ势垒 

分 类 号：O471.1[理学—半导体物理]