New Family of Robust 2D Topological Insulators in van der Waals Heterostructures

Abstract

We predict a new family of robust two-dimensional (2D) topological insulators in van der Waals heterostructures comprising graphene and chalcogenides BiTeX (X=Cl, Br and I). The layered structures of both constituent materials produce a naturally smooth interface that is conducive to proximity induced new topological states. First principles calculations reveal intrinsic topologically nontrivial bulk energy gaps as large as 70-80 meV, which can be further enhanced up to 120 meV by compression. The strong spin-orbit coupling in BiTeX has a significant influence on the graphene Dirac states, resulting in the topologically nontrivial band structure, which is confirmed by calculated nontrivial Z2 index and an explicit demonstration of metallic edge states. Such heterostructures offer an unique Dirac transport system that combines the 2D Dirac states from graphene and 1D Dirac edge states from the topological insulator, and it offers new ideas for innovative device designs.

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• Colloquium: Topological Band Theory
• Topological Phases in Two-Dimensional Materials: A Brief Review
• New Family of Quantum Spin Hall Insulators in Two-dimensional Transition-Metal Halide with Large Nontrivial Band Gaps
• Signature of large-gap quantum spin Hall state in the layered mineral jacutingaite
• Two-Dimensional Inversion Asymmetric Topological Insulators in Functionalized III-Bi Bilayers
• Backscattering immunity of dipole-exchange magnetostatic surface spin waves
• Exfoliation of single layer BiTeI flakes
• Imaging Carrier Inhomogeneities in Ambipolar Tellurene Field Effect Transistors
• ${\mathbb{Z}}_2$ invariance of Germanene on MoS${}_2$ from first principles
• Robust Room-Temperature Quantum Spin Hall Effect in Methyl-functionalized InBi honeycomb film
• Machine-learning accelerated identification of exfoliable two-dimensional materials
• Gallium Bismuth Halides GaBi-X2 (X= I, Br, Cl) Monolayers with Distorted Hexagonal Framework: Novel Room-Temperature Quantum Spin Hall Insulators
• Topological crystalline insulators from stacked graphene layers
• Time-reversal invariant finite-size topology
• Uniaxial Strain Induced Topological Phase Transition in Bismuth-Tellurohalide-Graphene Heterostructures
• Time-Reversal Invariant Topological Superconductivity in Planar Josephson Bijunction
• Finite-size topological phases from semimetals
• Time-reversal invariant topological skyrmion phases
• An anomalous band inversion protected by symmetry in a topological insulator of the Kane-Mele model
• Topological Phase Diagram of BiTeX--Graphene Hybrid Structures
• Emergent topology in thin films of nodal line semimetals
• Crystalline finite-size topology