无相互作用双量子点中的珀耳帖效应

Peltier Effect in Noninteracting Double Quantum Dots

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.