Thermoelectric efficiency of topological insulators in a magnetic field

Details Thermoelectric efficiency of topological insulators in a magnetic field Thermoelectric efficiency of topological insulators in a magnetic field

2011-10-27

arxiv.org/abs/1110.5964v1

J. Appl. Phys. 111, 07E319 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 4 figures, Proceedings of MMM 2011

Scientific paper

10.1063/1.3672847

We study the thermoelectric properties of three-dimensional topological insulators in magnetic fields with many holes (or pores) in the bulk. We find that at high density of these holes in the transport direction the thermoelectric figure of merit, ZT, can be large due to the contribution of the topologically protected conducting surfaces and the suppressed phonon thermal conductivity. By applying an external magnetic field a subgap can be induced in the surface states spectrum. We show that the thermoelectric efficiency can be controlled by this tunable subgap leading to the values of ZT much greater than 1. Such high values of ZT for reasonable system parameters and its tunability by magnetic field make this system a strong candidate for applications in heat management of nanodevices, especially at low temperatures.

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