Hinged Quantum Spin-Hall Effect in Antiferromagnetic Topological Insulators

Abstract

In this work, we predict a hinged quantum spin-Hall (HQSH) effect featured by a pair of helical hinge modes in antiferromagnetic (AFM) topological insulator (TI) multilayers. This pair of helical hinge modes are localized on the hinges of the top and bottom surfaces of the AFM TI multilayers. Unlike the conventional QSH effect, the HQSH effect survives the breaking of time-reversal symmetry (TRS) and thus represents a different kind of topological phenomenon. The helical hinge modes are sustainable to inelastic scattering and TRS-breaking disorder, which can be observed in macroscopic samples. We show that this HQSH effect can be understood as a three-dimensional generalization of the Su-Schrieffer-Heeger model and its topology is characterized by the spin Chern number. At last, we propose that the HQSH effect can be realized in newly found intrinsic AFM TI materials (MnBi${}_2$Te${}_4$)${}_m$(Bi${}_2$Te${}_3$)${}_n$ or magnetic-doped TI multilayers by current experimental setups.

6 pages, 4 figures

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• Higher-Order topological insulator in a dodecagonal quasicrystal
• Layer Hall effect induced by hidden Berry curvature in antiferromagnetic insulators
• Topological magnetic materials of the (MnSb${}_2$Te${}_4$)$\cdot$(Sb${}_2$Te${}_3$)${}_n$ van der Waals compounds family
• Using nonlocal surface transport to identify the axion insulator
• A Higher-Order Topological Insulator Phase in a Modulated Haldane Model
• Higher-order topological Anderson insulators in quasicrystals
• Light-induced half-quantized Hall effect and axion insulator
• Direct dynamical characterization of higher-order topological insulators with nested band inversion surfaces
• Bulk-boundary correspondence in disordered higher-order topological insulators
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Quasicrystalline second-order topological semimetals
• Density-driven higher-order topological phase transitions in amorphous solids
• Hinge Spin Polarization in Magnetic Topological Insulators Revealed by Resistance Switch
• On the half-quantized Hall conductance of massive surface electrons in magnetic topological insulator films
• Bulk-boundary-transport correspondence of the second-order topological insulators
• Experimental realization of Majorana hinge and corner modes in intrinsic organic topological superconductor without magnetic field at room temperature
• Magneto-optical Kerr and Faraday effects in bilayer antiferromagnetic insulators