Strain Tunable Semimetal-Topological-Insulator Transition in Monolayer 1T'-WTe2

Abstract

A quantum spin hall insulator(QSHI) is manifested by its conducting edge channels that originate from the nontrivial topology of the insulating bulk states. Monolayer 1T'-WTe2 exhibits this quantized edge conductance in transport measurements, but because of its semimetallic nature, the coherence length is restricted to around 100 nm. To overcome this restriction, we propose a strain engineering technique to tune the electronic structure, where either a compressive strain along a axis or a tensile strain along b axis can drive 1T'-WTe2 into an full gap insulating phase. A combined study of molecular beam epitaxy and in-situ scanning tunneling microscopy/spectroscopy then confirmed such a phase transition. Meanwhile, the topological edge states were found to be very robust in the presence of strain.

15 pages, 5 figure and 21 pages of supplementary material

References in corpus (5)

• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• Strain-induced partially flat band, helical snake states, and interface superconductivity in topological crystalline insulators
• Electronic structure of molecular beam epitaxy grown 1T${}^{\prime }$-MoTe${}_2$ film and strain effect
• Flat Bands in Buckled Graphene Superlattices

Cited by in corpus (26)

• Evidence for a Monolayer Excitonic Insulator
• Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet
• Atomically Thin Quantum Spin Hall Insulators
• Quantum Spin Hall Effect in Ta${}_2$M${}_3$Te${}_5$ (M = Pd, Ni)
• Nonvolatile ferroelectric control of topological states in 2D heterostructures
• Shift current response in elemental two-dimensional ferroelectrics
• Electric field effects on the band gap and edge states of monolayer 1T'-WTe2
• Tuning the Many-body Interactions in a Helical Luttinger Liquid
• Multi-Band Superconductivity in Strongly Hybridized 1T'-WTe${}_2$/NbSe${}_2$ Heterostructures
• Realistic tight-binding model for monolayer transition metal dichalcogenides in 1T' structure
• A gate-tunable quantum phase transition in a topological excitonic insulator
• Theory of Glide Symmetry Protected Helical Edge States in WTe${}_2$ Monolayer
• Two-dimensional Dirac semiconductor and its material realization
• Structural and electronic phase transitions in Zr${}_{1.03}$Se${}_2$ at high pressure
• A complementary screening for quantum spin Hall insulators in 2D exfoliable materials
• Quantum spin Hall states in the lateral heteromonolayers of WTe2-MoTe2
• Thermal robustness of the quantum spin Hall phase in monolayer WTe${}_2$
• Designing Xenes with Two-Dimensional Triangular Lattice
• Robust Coulomb Gap and Varied-temperature Study of Epitaxial 1T'-WSe${}_2$ Monolayers
• Programmable Kondo Effect Formed by Landau Levels
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Strain-dependent one-dimensional confinement channels in twisted bilayer 1T${}^{\prime }$-WTe${}_2$
• Electronic properties of the steps in bilayer Td-WTe2
• Intercalation of Alkali Metal into WTe2, the Crystal Structure of A0.5WTe2 and Observation of a Metal-to-Semiconductor Transition
• Persistent spin texture preserved by local symmetry in graphene/WTe${}_2$ heterostructure
• Tuning Charge Order in $\kappa$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$X (X=Br, Cl) via Uniaxial Strain