Álamo Manuel, Muñoz Enrique
Physics Institute, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago 7820436, Chile.
Research Center for Nanotechnology and Advanced Materials CIEN-UC, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago 7820436, Chile.
Entropy (Basel). 2018 May 14;20(5):366. doi: 10.3390/e20050366.
We studied the non-equilibrium current, transport coefficients and thermoelectric performance of a nano-junction, composed by a quantum dot connected to a normal superconductor and a topological superconductor leads, respectively. We considered a one-dimensional topological superconductor, which hosts two Majorana fermion states at its edges. Our results show that the electric and thermal currents across the junction are highly mediated by multiple Andreev reflections between the quantum dot and the leads, thus leading to a strong nonlinear dependence of the current on the applied bias voltage. Remarkably, we find that our system reaches a sharp maximum of its thermoelectric efficiency at a finite bias, when an external magnetic field is imposed upon the junction. We propose that this feature can be used for accurate temperature sensing at the nanoscale.
我们研究了一个纳米结的非平衡电流、输运系数和热电性能，该纳米结分别由连接到正常超导体和拓扑超导体引线的量子点组成。我们考虑了一种一维拓扑超导体，其边缘存在两个马约拉纳费米子态。我们的结果表明，结两端的电电流和热电流在很大程度上由量子点和引线之间的多次安德烈夫反射介导，从而导致电流对施加的偏置电压具有强烈的非线性依赖性。值得注意的是，我们发现当在结上施加外部磁场时，我们的系统在有限偏置下达到其热电效率的尖锐最大值。我们提出这一特性可用于纳米尺度的精确温度传感。
