Direct Visualization of 2D Topological Insulator in Single-layer 1T'-WTe2

Abstract

We grow nearly freestanding single-layer 1T'-WTe2 on graphitized 6H-SiC(0001) by using molecular beam epitaxy (MBE), and characterize its electronic structure with scanning tunneling microscopy / spectroscopy (STM/STS). We demonstrate the existence of topological edge states at the periphery of single-layer WTe2 islands. Surprisingly, we also find a band gap in the bulk and the semiconducting behaviors of the single-layer WTe2 at low temperature, which is likely resulted from an incommensurate charge density wave (CDW) transition. The realization of two-dimensional topological insulators (2D TIs) in single-layer transition metal dichalcogenide (TMD) thus provides a promising platform for further exploration of the 2D TIs' physics and related applications.

arXiv comment12 pages, 5 figures, submitted on Feb 13, 2017 to Phys. Rev. B (Rapid Communications) 2017

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Cited by in corpus (74)

• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
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• Electrically switchable Berry curvature dipole in the monolayer topological insulator WTe2
• Gate-induced superconductivity in a monolayer topological insulator
• Observation of topological states residing at step edges of WTe2
• Berry curvature dipole current in transition metal dichalcogenides family
• Imaging Quantum Spin Hall Edges in Monolayer WTe2
• Observation of Topologically Protected States at Crystalline Phase Boundaries in Single-layer WSe2
• Proximity-induced superconducting gap in the quantum spin Hall edge state of monolayer WTe${}_2$
• Inversion-protected higher order topological superconductivity in monolayer WTe${}_2$
• Nonlinear Hall effect with time-reversal symmetry: Theory and material realizations
• Strain Tunable Semimetal-Topological-Insulator Transition in Monolayer 1T'-WTe2
• Observation of Coulomb gap in the quantum spin Hall candidate single-layer 1T'-WTe${}_2$
• Canted Spin Texture and Quantum Spin Hall Effect in WTe2
• Atomically Thin Quantum Spin Hall Insulators
• Superconductivity in Potassium-intercalated Td-WTe2
• Partial lattice defects in higher order topological insulators
• Temperature-Induced Lifshitz Transition and Possible Excitonic Instability in ZrSiSe
• Nonlocal Thermoelectricity in a S-TI-S Junction in Contact with a N-Metal Probe: Evidence for Helical Edge States
• Qsymm: Algorithmic symmetry finding and symmetric Hamiltonian generation
• The influence of lattice termination on the edge states of the quantum spin Hall insulator monolayer $1T^{\prime }$-WTe${}_2$
• Testing Topological Protection of Edge States in Hexagonal Quantum Spin Hall Candidate Materials
• Helical Liquids in Semiconductors
• Experimental Progress on Layered Topological Semimetals
• Electric field effects on the band gap and edge states of monolayer 1T'-WTe2
• Electronic Janus lattice and kagome-like bands in coloring-triangular MoTe2 monolayers
• Dimensional Crossover and Topological Phase Transition in Dirac Semimetal Na3Bi Films
• Low-symmetry topological materials for large charge-to-spin interconversion: The case of transition metal dichalcogenide monolayers
• Tuning the Many-body Interactions in a Helical Luttinger Liquid
• Observation of Shubnikov-de Haas Oscillations in Large-Scale Weyl Semimetal WTe2 Films
• Symmetry dictated grain boundary state in a two-dimensional topological insulator
• First principles feasibility assessment of a topological insulator at the InAs/GaSb interface
• Epitaxial Growth of Quasi-One-Dimensional Bismuth-Halide Chains with Topological Non-Trivial Edge States
• Observation of quantum spin Hall states in Ta${}_2$Pd${}_3$Te${}_5$
• Tunable plasmons in large area WTe2 thin films
• Crossover Between Weak Antilocalization and Weak Localization and Electron-Electron Interaction in Few-Layer WTe${}_2$
• Helical edge transport in the presence of a magnetic impurity: the role of local anisotropy
• Nonlocal thermoelectric engines in hybrid topological Josephson junctions
• Multi-Band Superconductivity in Strongly Hybridized 1T'-WTe${}_2$/NbSe${}_2$ Heterostructures
• Influence of point defects on the electronic and topological properties of monolayer WTe${}_2$
• Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy
• Realistic tight-binding model for monolayer transition metal dichalcogenides in 1T' structure
• The study on quantum material WTe2
• Switchable large-gap quantum spin Hall state in two-dimensional MSi${}_2$Z${}_4$ materials class
• Unrestricted electron bunching at the helical edge
• Quantum spin Hall edge states and interlayer coupling in twisted-bilayer WTe${}_2$
• A gate-tunable quantum phase transition in a topological excitonic insulator
• Evidence of topological edge states in a superconducting nonsymmorphic nodal-line semimetal
• Optical absorption measurement of spin Berry curvature and spin Chern marker
• Raman spectrum of 1T'-WTe2 under tensile strain: A first-principles prediction
• Gate-defined Josephson weak-links in monolayer $\mathrm{WT}{\mathrm{e}}_2$
• Breakdown of helical edge state topologically protected conductance in time-reversal-breaking excitonic insulators
• Theory of Glide Symmetry Protected Helical Edge States in WTe${}_2$ Monolayer
• Second Harmonic Helicity and Faraday Rotation in Gated Single-Layer 1T${}^{\prime }$-WTe${}_2$
• Finite frequency backscattering current noise at a helical edge
• Disorder-induced coupling of Weyl nodes in WTe${}_2$
• Scattering in quantum wires and junctions of quantum wires with edge states of quantum spin Hall insulators
• Analytical and Numerical study of the out-of-equilibrium current through a helical edge coupled to a magnetic impurity
• Density Functional Theory and Deep-learning to Accelerate Data Analytics in Scanning Tunneling Microscopy
• Low-energy effective theory and anomalous Hall effect in monolayer ${\mathrm{WTe}}_2$
• Higher-order topological superconductivity in monolayer WTe${}_2$ from repulsive interactions
• Edge spin transport in the disordered two-dimensional topological insulator WTe${}_2$
• Quantum spin Hall states in the lateral heteromonolayers of WTe2-MoTe2
• Strain-dependent one-dimensional confinement channels in twisted bilayer 1T${}^{\prime }$-WTe${}_2$
• Width-dependent Photoluminescence and Anisotropic Raman Spectroscopy from Monolayer MoS${}_2$ Nanoribbons
• Robust Coulomb Gap and Varied-temperature Study of Epitaxial 1T'-WSe${}_2$ Monolayers
• Van der Waals epitaxy of Weyl-semimetal Td-WTe${}_2$
• Single Crystal Growth and Transport Properties of van der Waals Materials $AB$Te${}_4$ ($A/B$ = Ti, Zr, Hf)
• Electronic properties of the steps in bilayer Td-WTe2
• Pseudo-hydrodynamic flow of quasiparticles in semimetal WTe2 at room temperature
• Electronic band structure from quasiparticle interference and Landau quantization in WTe${}_2$
• A monolayer transition metal dichalcogenide as a topological excitonic insulator
• Reversal of charge transfer doping on the negative electronic compressibility surface of MoS2
• Emergent One-Dimensional Helical Channel in Higher-Order Topological Insulators with Step Edges