Sánchez Rafael, Sothmann Björn, Jordan Andrew N
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain.
Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland.
Phys Rev Lett. 2015 Apr 10;114(14):146801. doi: 10.1103/PhysRevLett.114.146801. Epub 2015 Apr 7.
The thermoelectric properties of a three-terminal quantum Hall conductor are investigated. We identify a contribution to the thermoelectric response that relies on the chirality of the carrier motion rather than on spatial asymmetries. The Onsager matrix becomes maximally asymmetric with configurations where either the Seebeck or the Peltier coefficients are zero while the other one remains finite. Reversing the magnetic field direction exchanges these effects, which originate from the chiral nature of the quantum Hall edge states. The possibility to generate spin-polarized currents in quantum spin Hall samples is discussed.
研究了三端量子霍尔导体的热电性质。我们确定了一种对热电响应的贡献，它依赖于载流子运动的手征性而非空间不对称性。对于塞贝克系数或珀尔帖系数为零而另一个保持有限的配置，昂萨格矩阵变得最大程度不对称。反转磁场方向会交换这些效应，它们源于量子霍尔边缘态的手征性质。讨论了在量子自旋霍尔样品中产生自旋极化电流的可能性。
