Intrinsic contribution to nonlinear thermoelectric effects in topological insulators

Pankaj Bhalla
Phys. Rev. B 103, 115304 – Published 3 March 2021

Abstract

Irradiation of strong light on a material leads to numerous nonlinear effects that are essential to understand the physics of excited states of the system and optoelectronics. Here, we study the nonlinear thermoelectric effects due to the electric and thermal fields applied on a noncentrosymmetric system. The phenomenon arises on the Fermi surface with the transitions of electrons from the valence to conduction bands. We derive the formalism to investigate these effects and find that the nonlinearity in these effects, namely, nonlinear Seebeck and nonlinear Peltier effects, depends on the ratio of the nonlinear to linear conductivities. The theory is tested for a hexagonally warped and gapped topological insulator. Results show enhancement in the longitudinal and Hall effects on increasing the warping strength but show opposite behavior with the surface gap.

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  • Received 8 December 2020
  • Accepted 19 February 2021

DOI:https://doi.org/10.1103/PhysRevB.103.115304

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Pankaj Bhalla*

  • Beijing Computational Science Research Center, Beijing 100193, China

  • *bhalla@csrc.ac.cn

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Issue

Vol. 103, Iss. 11 — 15 March 2021

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