Helical spin thermoelectrics controlled by a side-coupled magnetic quantum dot in the quantum spin Hall state
Helical spin thermoelectrics controlled by a side-coupled magnetic quantum dot in the quantum spin Hall state
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DOI：
10.1103/physrevb.98.195429
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发表时间：
2018-11-19
影响因子：
3.7
通讯作者：
Fradkin, Eduardo
中科院分区：
文献类型：
--
作者：
Roura-Bas, Pablo;Arrachea, Liliana;Fradkin, Eduardo
我们研究了一个器件的热电响应，该器件包含一对在相同温度T和化学势μ下接触的螺旋边缘态，并通过侧量子点连接到具有不同化学势和温度的外部库。通过在量子点处施加磁场B和栅极电压V-g，可以诱导不同的操作模式。在有限的B，量子点同时充当电荷和自旋过滤器。不仅通过量子点，而且沿着边缘态诱导电荷和自旋电流。我们专注于线性响应和分析的制度，我们确定为充电热机或制冷机，自旋热机，自旋制冷机。
We study the thermoelectric response of a device containing a pair of helical edge states contacted at the same temperature T and chemical potential mu and connected to an external reservoir, with different chemical potential and temperature, through a side quantum dot. Different operational modes can be induced by applying a magnetic field B and a gate voltage V-g at the quantum dot. At finite B, the quantum dot acts simultaneously as a charge and a spin filter. Charge and spin currents are induced, not only through the quantum dot, but also along the edge states. We focus on linear response and analyze the regimes, which we identify as charge heat engines or refrigerator, spin heat engine, and spin refrigerator.