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

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.

6 pages, 3 figures

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Cited by in corpus (9)

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• Orbital Floquet Engineering of Exchange Interactions in Magnetic Materials
• Light-induced half-quantized Hall effect and axion insulator
• Light-induced phase crossovers in a quantum spin Hall system
• Optically induced topological states on the surface of mercury telluride
• Phase transitions in intrinsic magnetic topological insulator with high-frequency pumping
• Structure of surface electronic states in strained mercury telluride
• Inducing anisotropies in Dirac fermions by periodic driving
• Emergent Weyl-like points in periodically modulated systems