Valley-polarized quantum anomalous Hall phase and disorder induced valley-filtered chiral edge channels

Abstract

We investigate the topological and transport properties of the recently discovered valley-polarized quantum anomalous Hall (VQAH) phase. In single layer, the phase is realized through the competition between two types of spin-orbit coupling, which breaks the symmetry between the two valleys. We show that the topological phase transition from conventional quantum anomalous Hall phase to the VQAH phase is due to the change of topological charges with the generation of additional skyrmions in the real spin texture, when the band gap closes and reopens at one of the valleys. In the presence of short range disorders, pairs of the gapless edge channels (one from each valley in a pair) would be destroyed due to intervalley scattering. However, we discover that in an extended range of moderate scattering strength, the transport through the system is quantized and fully valley-polarized, i.e. the system is equivalent to a quantum anomalous Hall system with valley-filtered chiral edge channels. We further show that with additional layer degree of freedom, much richer phase diagram could be realized with multiple VQAH phases. For a bilayer system, we demonstrate that topological phase transitions could be controlled by the interlayer bias potential.

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• Dirac and Weyl Materials: Fundamental Aspects and Some Spintronics Applications
• Correlation-driven topological and valley states in monolayer VSi${}_2$P${}_4$
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• Perfect Valley Filter in Topological Domain Wall
• van der Waals Heterostructures of Germanene, Stanene and Silicene with Hexagonal Boron Nitride and Their Topological Domain Walls
• Manipulation and Characterization of the Valley Polarized Topological Kink States in Graphene Based Interferometers
• Electric field controlled spin- and valley-polarized edge states in silicene with extrinsic Rashba effect
• Disorder Effects in Topological States -- Brief Review of the Recent Developments
• Floquet Valley-Polarized Quantum Anomalous Hall State in Nonmagnetic Heterobilayers
• Cornertronics in Two-Dimensional Second-Order Topological Insulators
• Robust all-electrical topological valley filtering using monolayer 2D-Xenes
• Pure spin current and perfect valley filter by designed separation of the chiral states in two-dimensional honeycomb lattices
• Magnetic field induced Valley-Polarized Quantum Anomalous Hall Effects in Ferromagnetic van der Waals Heterostructures
• Perfect valley filter based on topological phase in disordered $\mathrm{Sb}$ Monolayer Heterostructure
• Band bending and zero-conductance resonances controlled by edge electric fields in zigzag silicene nanoribbons
• Multimechanism quantum anomalous Hall and Chern number tunable states in germanene (silicene, stanene)/$M$Bi${}_2$Te${}_4$ heterostructures
• Buckled honeycomb lattice and unconventional magnetic response
• Topologically trivial and nontrivial edge bands in graphene induced by irradiation
• Valley Gapless Semiconductor: Models and Applications
• Valley-Polarized Quantum Anomalous Hall Phase in Bilayer Graphene with Layer-Dependent Proximity Effects