On optical field driven quantum spin Hall phase in Bi_2Se_3 thin film with magnetic Impurities

Authors

• Udai Prakash Tyagi * ¹
• Partha Sarathi Goswami ¹

• Deshbandhu College, University of Delhi, Kalkaji, New Delhi-110019, India

Abstract

The normal incidence of circularly polarized optical field (POF) of tunable intensity on the topological insulator Bi₂Se₃ film is shown to give rise to the quantum spin Hall (QSH) effect, in the presence of the magnetic impurities (MI), starting with a low-energy two-dimensional, time-dependent Hamiltonian in the framework of the Floquet theory. The quantized topological number- the Kane–Mele index Z2 for QSH phase- strongly support this topological state.

Keywords

• Circularly polarized optical field
• Floquet theory
• Kane– Mele index Z2
• Magnetic impurities
• Quantum spin Hall phase