The influence of lattice termination on the edge states of the quantum spin Hall insulator monolayer $1T^{\prime }$-WTe${}_2$

Abstract

We study the influence of sample termination on the electronic properties of the novel quantum spin Hall insulator monolayer $1T^{\prime }$-WTe${}_2$. For this purpose, we construct an accurate, minimal 4-orbital tight-binding model with spin-orbit coupling by employing a combination of density-functional theory calculations, symmetry considerations, and fitting to experimental data. Based on this model, we compute energy bands and 2-terminal conductance spectra for various ribbon geometries with different terminations, with and without magnetic field. Because of the strong electron-hole asymmetry we find that the edge Dirac point is buried in the bulk bands for most edge terminations. In the presence of a magnetic field, an in-gap edge Dirac point leads to exponential suppression of conductance as an edge Zeeman gap opens, whereas the conductance stays at the quantized value when the Dirac point is buried in the bulk bands. Finally, we find that disorder in the edge termination drastically changes this picture: the conductance of a sufficiently rough edge is uniformly suppressed for all energies in the bulk gap regardless of the orientation of the edge.

arXiv comment8 pages + Supplemental Material, contains link to data repository

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• Direct observation of topological surface state in the topological superconductor 2M-WS2
• Spin-polarized tunable photocurrents
• 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${}_2$
• A gate-tunable quantum phase transition in a topological excitonic insulator
• Possible Sliding Regimes in Twisted Bilayer WTe${}_2$
• Fast electrically switchable large gap quantum spin Hall states in MGe${}_2$Z${}_4$
• Theory of Glide Symmetry Protected Helical Edge States in WTe${}_2$ Monolayer
• Time-reversal invariant finite-size topology
• Cooperative orbital moments and edge magnetoresistance in monolayer WTe${}_2$
• Second Harmonic Helicity and Faraday Rotation in Gated Single-Layer 1T${}^{\prime }$-WTe${}_2$
• Higher-order topological superconductivity in monolayer WTe${}_2$ from repulsive interactions
• Low-energy effective theory and anomalous Hall effect in monolayer ${\mathrm{WTe}}_2$
• Edge spin transport in the disordered two-dimensional topological insulator WTe${}_2$
• Unconventional pairing in Ising superconductors: Application to monolayer NbSe${}_2$
• Electronic properties of the steps in bilayer Td-WTe2
• Layer dependent topological phases and transitions in TaRhTe${}_4$: From monolayer and bilayer to bulk
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• Nodal higher-order topological superconductivity from C6-symmetric Dirac semimetals