具有旁耦合量子点的A-B环中的持续电流  

The Persistent Current in A-B Ring with a Side-Coupled Quantum Dot

作　　者：周波[1] 吴绍全[2] 李铁[1] 

机构地区：[1]重庆工学院数理学院,重庆400050 [2]四川师范大学物理系,四川成都610066

出　　处：《四川师范大学学报（自然科学版）》2005年第1期86-89,共4页Journal of Sichuan Normal University（Natural Science）

摘　　要：对具有旁耦合量子点的介观环中的持续电流作了研究,采用单一杂质安德森模型哈密顿量,运用平均场理论Slave Boson技术处理,结果表明:处于近腾体系的具有旁耦合量子点的A B环中的持续电流与电子自旋有关,并且在δ/T0k 1极限条件下,两个部分的电荷移动被抑制.在不同的值的条件下,环中电流值的大小不同.因此,为研究近腾屏蔽云提供了一条新途径.We have investigated the persistent current in a mesoscopic ring with a side-coupled quantum dot.We have probed the problem by using the one-impurity Anderson Hamiltonian and Slave-Boson mean field theory. It is shown that the persistent current in Abarono-Bohm ring is related to the spin fluctuations and in the limit of δ/T^0_k1, the charge transfers between two subsystems is suppressed. Under different conditions, the current in the ring has different values. The persistent current measurement provides an opportunity to detect Kondo screening cloud.

关 键 词：量子点 近腾效应 持续电流 近腾屏蔽云 

分 类 号：O514.2[理学—低温物理]