Tunable Radiation Field Aided Quantum Spin Hall Phase in Bi2Se3Thin Film

TL;DR

This paper demonstrates how a tunable near-infrared circularly polarized radiation field can induce a quantum spin Hall phase in Bi2Se3 thin films doped with magnetic impurities, using Floquet theory to analyze the system.

Contribution

It introduces a method to induce and control the quantum spin Hall phase in magnetic impurity-doped Bi2Se3 via optical field tuning, expanding potential applications in spintronics.

Findings

Optical field induces quantum spin Hall phase in Bi2Se3.

High-intensity radiation can switch from quantum anomalous Hall to spin Hall phase.

Magnetic impurities do not prevent the emergence of the spin Hall phase.

Abstract

We show fledgling quantum spin Hall phase by the normal incidence of near-infrared circularly polarized radiation field on Bismuth Selenide doped with magnetic impurities. For this purpose, we start with a low-energy two-dimensional, time-dependent Hamiltonian. The time dependence in the Hamiltonian arises due to the optical field describable by the associated gauge field. We make use of the Floquet theory in the high-frequency limit to investigate the system. The optical field tuneability leads to the emergence of the spin Hall phase, when intensity of the incident radiation is high, from the quantum anomalous Hall phase. Interestingly, the former phase is achievable here even in the presence of the magnetic impurities.