微振荡并联双量子点AB干涉仪的量子输运特性  

Quantum Transmission in Micro-oscillation Parallel Double Quantum Dot AB Interferometer

作　　者：李林 李志坚[1] LI Lin;LI Zhijian(Institute of Theoretical Physics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学理论物理研究所,山西太原030006

出　　处：《山西大学学报（自然科学版）》2021年第6期1106-1113,共8页Journal of Shanxi University(Natural Science Edition)

基　　金：山西省自然科学基金(201601D011009)。

摘　　要：基于非平衡格林函数方法,考虑量子点和电极耦合界面的微小振荡,研究了并联双量子点AB干涉仪的输运性质。把双时格林函数中的时间分为快变的相对时间和慢变的质心时间,在Wigner空间近似求解Kadanoff-Baym方程,得到格林函数对质心时间各阶求导对电导的修正。在弱耦合情况下,讨论了通过调节两个子AB环中的磁通和两个并联量子点之间的耦合强度,对系统的输运行为的改变,说明了电导的二阶修正可以增强Fano共振效应。We consider the micro-oscillation of the coupling interface between quantum dot and electrode to study the transport properties of the parallel double quantum dot AB ring. Based on non-equilibrium Green’s function method, we separate time scales in the Green’s functions as fast relative time and slow central time to solve the Kadanoff-Baym equations in Wigner representation. The second correction to conductance is obtained. It is found that the transport efficiency of the system in the case of weak coupling is improved by adjusting the magnetic flux in the two AB rings and the coupling strength between the two parallel quantum dots, moreover, the Fano effect is enhanced by the second correction to conductance.

关 键 词：非平衡格林函数 量子点 AB干涉仪 Fano效应 

分 类 号：O413[理学—理论物理]