Large thermoelectric figure of merit for 3D topological Anderson insulators via line dislocation engineering

Abstract

We study the thermoelectric properties of three-dimensional topological Anderson insulators with line dislocations. We show that at high densities of dislocations the thermoelectric figure of merit ZT can be dominated by one-dimensional topologically-protected conducting states channeled through the lattice screw dislocations in the topological insulator materials with a non-zero time-reversal-invariant momentum such as Bi_{1-x}Sb_x. When the chemical potential does not exceed much the mobility edge the ZT at room temperatures can reach large values, much higher than unity for reasonable parameters, hence making this system a strong candidate for applications in heat management of nano-devices.

4 pages, 3 figures

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• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• The quantum spin Hall effect and topological insulators
• Helical Metal Inside a Topological Band Insulator
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• Band Structure and Polarization Effects in Photothermoelectric Spectroscopy of a Bi2Se3 Device
• Tunneling behavior of bismuth telluride nanoplates in electrical transport