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 /K. These characteristics also appear when the distance from the Dirac point to the Fermi level is lower than the thermal energy.
- Received 19 May 2016
DOI:https://doi.org/10.1103/PhysRevB.94.165311
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