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Thermoelectric transport in perfectly conducting channels in quantum spin Hall systems

2010; American Physical Society; Volume: 81; Issue: 16 Linguagem: Inglês

10.1103/physrevb.81.161302

1550-235X

Ryuji Takahashi, Shuichi Murakami,

Graphene research and applications

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.