Bulg. J. Phys. vol.50 no.4 (2023), pp. 367-378

Tuneable Radiation Field Aided Quantum Spin Hall Phase in Bi2Se3 Thin Film

Partha Goswami, Udai Prakash Tyagi
D.B. College, University of Delhi, Kalkaji, New Delhi-110019, India
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 twodimensional, 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.

doi: https://doi.org/10.55318/bgjp.2023.50.4.367

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