Giant thermoelectric figure of merit in a noninteracting quantum dot system with massless Dirac fermions

Tomosuke Aono and Takashi Komine
Phys. Rev. B 94, 165311 – Published 25 October 2016

Abstract

We investigate the thermoelectric characteristics of a quantum dot system with massless Dirac fermions, in which the tunneling coupling between the quantum dot and the Dirac fermions has a pseudogap. The maximum values of the thermoelectric figure of merit and the thermopower can be made independent of temperature by tuning the energy level of the dot; the maximum value of the thermoelectric figure of merit is much greater than unity, and that of the thermopower is approximately 500μV/K. These characteristics also appear when the distance from the Dirac point to the Fermi level is lower than the thermal energy.

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  • Received 19 May 2016

DOI:https://doi.org/10.1103/PhysRevB.94.165311

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Tomosuke Aono* and Takashi Komine

  • Faculty of Engineering, Ibaraki University, Hitachi 316-8511, Japan

  • *tomosuke.aono.ee@vc.ibaraki.ac.jp

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Issue

Vol. 94, Iss. 16 — 15 October 2016

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