Thermoelectric transport in perfectly conducting channels in quantum spin Hall systems

被引：75
|
作者：
Takahashi, Ryuji [1 ]
Murakami, Shuichi [1 ,2 ]
机构：
[1] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan
[2] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 16期
关键词：
TOPOLOGICAL-INSULATOR; FIGURE; MERIT;
D O I：
10.1103/PhysRevB.81.161302
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：4
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