Thermoelectric transport in junctions of Majorana and Dirac channels
Thermoelectric transport in junctions of Majorana and Dirac channels
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DOI：
10.1103/physrevb.95.195425
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发表时间：
2016-11
影响因子：
3.7
通讯作者：
D. S. Shapiro;D. Feldman;A. Mirlin;A. Shnirman
中科院分区：
文献类型：
--
作者：
D. S. Shapiro;D. Feldman;A. Mirlin;A. Shnirman
本文研究了三维拓扑绝缘体表面上的手征约瑟夫森接触中的热电流和热导。该接触由两个超导体旁边的马约拉纳通道和狄拉克通道的两个结组成。几何不对称导致没有相位偏置的超电流。狄拉克费米子的干涉引起电流和热流的振荡，其非常规周期为Aharonov-Bohm通量的函数$2\Phi_0=h/e$。由于Majorana模的无隙特性，热电效应没有阈值，电流-通量关系是非正弦的。根据磁通量，电流的方向可以是从热引线到冷引线，反之亦然。
We investigate the thermoelectric current and heat conductance in a chiral Josephson contact on a surface of a 3D topological insulator, covered with superconducting and magnetic insulator films. The contact consists of two junctions of Majorana and Dirac channels next to two superconductors. Geometric asymmetry results in a supercurrent without a phase bias. The interference of Dirac fermions causes oscillations of the electric and heat currents with an unconventional period $2\Phi_0=h/e$ as functions of the Aharonov-Bohm flux. Due to the gapless character of Majorana modes, there is no threshold for the thermoelectric effect and the current-flux relationship is non-sinusoidal. Depending on the magnetic flux, the direction of the electric current can be both from the hot to cold lead and vice versa.