Thermoelectricity by Perfectly Conducting Channels in Quantum Spin Hall Systems

Details Thermoelectricity by Perfectly Conducting Channels in Quantum Spin Hall Systems Thermoelectricity by Perfectly Conducting Channels in Quantum Spin Hall Systems

2009-10-26

arxiv.org/abs/0910.4827v2

Phys. Rev. B 81, 161302(R) (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, minor changes

Scientific paper

10.1103/PhysRevB.81.161302

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. 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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