Light-induced half-quantized Hall effect and axion insulator

Abstract

Motivated by the recent experimental realization of the half-quantized Hall effect phase in a three-dimensional (3D) semi-magnetic topological insulator [M. Mogi et al., Nature Physics 18, 390 (2022)], we propose a scheme for realizing the half-quantized Hall effect and axion insulator in experimentally mature 3D topological insulator heterostructures. Our approach involves optically pumping and/or magnetically doping the topological insulator surface, such as to break time reversal and gap out the Dirac cones. By toggling between left and right circularly polarized optical pumping, the sign of the half-integer Hall conductance from each of the surface Dirac cones can be controlled, such as to yield half-quantized ($0+1/2$), axion ($-1/2+1/2=0$), and Chern ($1/2+1/2=1$) insulator phases. We substantiate our results based on detailed band structure and Berry curvature numerics on the Floquet Hamiltonian in the high-frequency limit. Our paper showcases how topological phases can be obtained through mature experimental approaches such as magnetic layer doping and circularly polarized laser pumping and opens up potential device applications such as a polarization chirality-controlled topological transistor.

24 pages, 11 figures, update references, published version

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• Light-enhanced nonlinear Hall effect
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• The Layer Hall Effect without External Electric Field
• Anomalous Floquet Phases. A resonance phenomena
• Light-induced Floquet spin-triplet Cooper pairs in unconventional magnets
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• Nonlinear Hall effects with an exceptional ring
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• Floquet-Engineered Valley-Topotronics in Kekulé-Y Bond Textured Graphene Superlattice