Pure spin current and perfect valley filter by designed separation of the chiral states in two-dimensional honeycomb lattices
arXiv:1610.02546 · doi:10.1103/PhysRevB.94.155112
Abstract
We propose a realization of pure spin currents and perfect valley filter based on a quantum anomalous Hall insulator, around which edge states with up-spin and down-spin circulate. By applying staggered sublattice potential on the strips along the edges of sample, the edge states with down spin can be pushed into the inner boundaries of the strips while the other edge states with up spin remain on the outer boundaries, resulting in spatially separated chiral states with perfect spin polarization. Moreover, a valley filter, which is immune to short-range and smooth long-range scatterers, can be engineered by additionally applying boundary potentials on the outmost lattices of the sample. We also find that the boundary potential can be used to control the size effect induced oscillation of the inner chiral states. The connection of the boundary potential to size effect is revealed.
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Cited by in corpus (5)
- Robust all-electrical topological valley filtering using monolayer 2D-Xenes
- Antiferromagnetic spin valve from heterostructure of two-dimensional hexagonal crystals
- Spin-valley polarized edge states and quantum anomalous Hall states controlled by side potential in 2D honeycomb lattices
- Graphdiyne Nanoribbons with Open Hexagonal Rings: Existence of Topological Unprotected Edge States
- Trigonal warping induced terraced spin texture and nearly perfect spin polarization in graphene with Rashba effect