Impact of high-frequency pumping on anomalous finite-size effects in three-dimensional topological insulators

Anastasiia A. Pervishko, Dmitry Yudin, Ivan A. Shelykh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Lowering of the thickness of a thin-film three-dimensional topological insulator down to a few nanometers results in the gap opening in the spectrum of topologically protected two-dimensional surface states. This phenomenon, which is referred to as the anomalous finite-size effect, originates from hybridization between the states propagating along the opposite boundaries. In this work, we consider a bismuth-based topological insulator and show how the coupling to an intense high-frequency linearly polarized pumping can further be used to manipulate the value of a gap. We address this effect within recently proposed Brillouin-Wigner perturbation theory that allows us to map a time-dependent problem into a stationary one. Our analysis reveals that both the gap and the components of the group velocity of the surface states can be tuned in a controllable fashion by adjusting the intensity of the driving field within an experimentally accessible range and demonstrate the effect of light-induced band inversion in the spectrum of the surface states for high enough values of the pump.

Original languageEnglish
Article number075420
JournalPhysical Review B
Volume97
Issue number7
DOIs
Publication statusPublished - 16 Feb 2018
Externally publishedYes

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