Magnetoelectric effect in topological insulator films beyond the linear response regime

Dashdeleg Baasanjav, O. A. Tretiakov, Kentaro Nomura

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We study the response of topological insulator films to strong magnetic and electric fields beyond the linear response theory. As a model, we use a three-dimensional lattice Wilson-Dirac Hamiltonian where we simultaneously introduce both magnetic field through the Peierls substitution and electric field as a potential energy depending on lattice coordinate. We compute the electron energy spectrum by numerically diagonalizing this Hamiltonian and obtain quantized magnetoelectric polarizability. In addition, we find that the magnetoelectric effect vanishes as the film width decreases due to the hybridization of surface wave functions. Furthermore, applying a gate voltage between the surfaces, we observe several quantized plateaus of θ term, which are mainly determined by the Landau level structures on the top and bottom surfaces.

Original languageEnglish
Article number045149
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number4
DOIs
Publication statusPublished - 2014 Jul 31

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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