无相互作用双量子点中的珀耳帖效应  

Peltier Effect in Noninteracting Double Quantum Dots

作　　者：曾祥忠 叶绿洲 徐瑞雪 郑晓 Xiangzhong Zeng;Lyuzhou Ye;Rui-Xue Xu;Xiao Zheng(Hefei National Research Center for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学合肥微尺度物质科学国家研究中心,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2023年第4期404-410,I0034,共8页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.21973086 and No.21633006);the Ministry of Education of China(111 Project Grant No.B18051);the Fundamental Research Funds for the Central Universities(No.WK2060000018);The computational resources are provided by the Supercomputing Center of University of Science and Technology of China.

摘　　要：珀耳帖效应是一种重要的热电现象,它代表两个不同导体的界面之间由于电流流过而产生了温度梯度.本文研究了偏压下的串联无相互作用双量子点系统中的珀尔帖效应,通过应用精确的级联运动方程组方法,首先展示了该双量子点体系中的两个量子点的局域温度彼此不同.然后,从理论上分析了量子点间耦合和量子点-电极耦合对热电势和电流的影响.最后,阐明了上述两类耦合的变化对珀耳帖热和焦耳热的影响,进而导致了量子点的局域温度的变化.Peltier effect is an important thermoelectric phenomenon which stands for the generation of temperature gradient of the interface between two dissimilar conductors by the electric current flowing through them.In this work,we investigate the Peltier effect in serially coupled noninteracting double quantum dot system under a bias voltage.By means of an accurate hierarchical equations of motion approach,we first demonstrate that the local temperatures of the two dots differ from each other by applying an electric current through the dots.We then analyze theoretically the influence of interdot and dot-lead coupling on the thermopower and electric current.Finally,we elucidate the variation of Peltier heat and Joule heat with the interdot coupling and dot-lead coupling,which leads to the changes in the local temperature of the quantum dots.

关 键 词：珀耳帖效应 量子点 级联运动方程组 塞贝克系数 

分 类 号：TQ127.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程]