Thermoelectric transport in perfectly conducting channels in quantum spin Hall systems
Thermoelectric transport in perfectly conducting channels in quantum spin Hall systems
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DOI：
10.1103/physrevb.81.161302
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发表时间：
2010-04-15
影响因子：
3.7
通讯作者：
Murakami, Shuichi
中科院分区：
文献类型：
--
作者：
Takahashi, Ryuji;Murakami, Shuichi
理论研究了窄带几何中二维量子自旋霍尔系统的热电输运。我们发现，在高温下，在体状态的电子占主导地位。然而，通过降低温度，“完美传导”的边缘通道变得占主导地位，并且发生体到边缘的交叉。相应地，通过降低温度，品质因数首先降低，然后由于边缘状态主导的热电输运而再次增加。
Thermoelectric transport of two-dimensional quantum spin Hall systems are theoretically studied in narrow ribbon geometry. We find that at high temperature electrons in the bulk states dominate. However, by lowering temperature, the "perfectly conducting" edge channels becomes dominant, and a bulk-to-edge crossover occurs. Correspondingly, by lowering temperature, the figure of merit first decreases and then will increase again due to edge-state-dominated thermoelectric transport.