Quantum Spin-Valley Hall Kink States: From Concept to Materials Design

Abstract

We propose a general and tunable platform to realize high-density arrays of quantum spin-valley Hall kink (QSVHK) states with spin-valley-momentum locking based on a two-dimensional hexagonal topological insulator. Through the analysis of Berry curvature and topological charge, the QSVHK states are found to be topologically protected by the valley-inversion and time-reversal symmetries. Remarkably, the conductance of QSVHK states remains quantized against either nonmagnetic or long-range magnetic disorder, verified by the Green function calculations. Based on first-principles results, we show that QSVHK states, protected with a gap up to 287 meV, can be realized in bismuthene by alloy engineering, surface functionalization, or electric field, supporting non-volatile applications of spin-valley filters, valves, and waveguides even at room temperature.

arXiv comment7 pages, 4 figures

References in corpus (60)

• Topological insulators and superconductors
• Spintronics: Fundamentals and applications
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Electronic transport in two dimensional graphene
• WannierTools: An open-source software package for novel topological materials
• Valley contrasting physics in graphene: magnetic moment and topological transport
• The Valley Hall Effect in MoS2 Transistors
• Large-gap quantum spin Hall insulators in tin films
• The electronic properties of bilayer graphene
• Bismuthene on a SiC Substrate: A Candidate for a New High-Temperature Quantum Spin Hall Paradigm
• First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
• Detecting Topological Currents in Graphene Superlattices
• Stability of the quantum spin Hall effect: effects of interactions, disorder, and Z_2 topology
• Topological confinement in bilayer graphene
• Topological Phases in Two-Dimensional Materials: A Brief Review
• Generation and detection of pure valley current by electrically induced Berry curvature in bilayer graphene
• Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
• Valley-Polarized Quantum Anomalous-Hall Effects in Silicene
• Gate-tunable Topological Valley Transport in Bilayer Graphene
• Midgap edge states and pairing symmetry of quasi-one-dimensional organic superconductors
• Numerical study of the topological Anderson insulator in HgTe/CdTe quantum wells
• Domain walls in gapped graphene
• Gate-controlled topological conducting channels in bilayer graphene
• Direct imaging of topological edge states at a bilayer graphene domain wall
• Ultrafast spin-lasers
• Electronic Highways in Bilayer Graphene
• Two-Dimensional Topological Insulator State and Topological Phase Transition in Bilayer Graphene
• Valley-Hall Kink and Edge States in Multilayer Graphene
• A valley valve and electron beam splitter
• Anomalously large conductance fluctuations in weakly disordered graphene
• Quantized chiral edge conduction on reconfigurable domain walls of a magnetic topological insulator
• Edge solitons of topological insulators and fractionalized quasiparticles in two dimensions
• Transport in two-dimensional topological materials: recent developments in experiment and theory
• Intrinsic spin-orbit coupling gap and the evidence of a topological state in graphene
• Quantum spin/valley Hall effect and topological insulator phase transitions in silicene
• Phonon induced backscattering in helical edge states
• Topological kink states at a tilt boundary in gated multi-layer graphene
• Effects of electron scattering on the topological properties of nanowires: Majorana fermions from disorder and superlattices
• Silicon spin communication
• Perfect Valley Filter in Topological Domain Wall
• A new paradigm for the quantum spin Hall effect at high temperatures
• Giant Spin-valley Polarization and Multiple Hall Effect in Functionalized Bi Monolayers
• Manipulation and Characterization of the Valley Polarized Topological Kink States in Graphene Based Interferometers
• Quantum Spin-quantum Anomalous Hall Effect with Tunable Edge States in Sb Monolayer-based Heterostructures
• The valley filter efficiency of monolayer graphene and bilayer graphene line defect model
• Alloy engineering of topological semimetal phase transition in MgTa${}_{2-x}$Nb${}_x$N${}_3$
• Anderson Localization from Berry-Curvature Interchange in Quantum Anomalous Hall System
• Low-energy quasiparticle states near extended scatterers in d-wave superconductors and their connection with SUSY quantum mechanics
• Optically Probing Tunable Band Topology in Atomic Monolayers
• A scheme to realize the quantum spin-valley Hall effect in monolayer graphene
• Lateral Interfaces of Transition Metal Dichalcogenides: A Stable Tunable One-Dimensional Physics Platform
• Topological superconductors as nonrelativistic limits of Jackiw-Rossi and Jackiw-Rebbi models
• Perfect valley filter based on topological phase in disordered $\mathrm{Sb}$ Monolayer Heterostructure
• Resilience of Majorana Fermions in the face of Disorder
• Optically induced topological spin-valley Hall effect for exciton polaritons
• Chiral Hall effect in the kink states in topological insulators with magnetic domain walls

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