Understanding topological phase transition in transition metal dichalcogenides

Abstract

Despite considerable interest in layered transition metal dichalcogenides (TMDs), such as MX2 with M = (Mo, W) and X = (S, Se, Te), the physical origin of their topological nature is still poorly understood. In the conventional view of topological phase transition (TPT), the non-trivial topology of electron bands in TMDs is caused by the band inversion between metal d and chalcogen p orbital bands, where the former is pulled down below the latter. Here, we show that, in TMDs, the TPT is entirely different from the conventional speculation. In particular, MS2 and MSe2 exhibits the opposite behavior of TPT, such that the chalcogen p orbital band moves down below the metal d orbital band. More interestingly, in MTe2, the band inversion occurs between the metal d orbital bands. Our findings cast doubts on the common view of TPT and provide clear guidelines for understanding the topological nature in new topological materials to be discovered.

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Cited by in corpus (33)

• Realization of Quantum Spin Hall State in Monolayer 1T'-WTe2
• Higher-Order Topology, Monopole Nodal Lines, and the Origin of Large Fermi Arcs in Transition Metal Dichalcogenides XTe${}_2$ (X=Mo,W)
• Topological insulators in ordered double transition metals M${}_2^{\prime }$M$"$C${}_2$ (M${}^{\prime }$= Mo, W; M$"$= Ti, Zr, Hf) MXenes
• Quantum-spin-Hall insulator with a large gap: single-layer 1T' WSe${}_2$
• Observation of Topologically Protected States at Crystalline Phase Boundaries in Single-layer WSe2
• Origins of the structural phase transitions in MoTe${}_2$ and WTe${}_2$
• Universal stability of two-dimensional traditional semiconductors
• Microfocus laser-ARPES on encapsulated mono-, bi-, and few-layer 1T'-WTe${}_2$
• Symmetry, spin-texture, and tunable quantum geometry in a WTe${}_2$ monolayer
• Sub-picosecond photo-induced displacive phase transition in two-dimensional MoTe${}_2$
• Spin-orbit-parity coupled superconductivity in topological monolayer WTe${}_2$
• The influence of lattice termination on the edge states of the quantum spin Hall insulator monolayer $1T^{\prime }$-WTe${}_2$
• Custodial glide symmetry of quantum spin Hall edge modes in WTe${}_2$ monolayer
• Tailoring the Phase Transition and Electron-Phonon Coupling in 1T'-MoTe2 by Charge Doping: A Raman Study
• Determination of the spin axis in quantum spin Hall insulator monolayer WTe2
• Nonconventional screening of Coulomb interaction in two-dimensional semiconductors and metals: A comprehensive cRPA study of MX2 (M=Mo, W, Nb, Ta; X=S, Se, Te)
• Large thermoelectric power factor of high-mobility 1T'' phase of transition-metal dichalcogenides
• 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${}_2$
• Traversing double-well potential energy surfaces: photoinduced concurrent intralayer and interlayer structural transitions in XTe2 (X=Mo, W)
• Realistic tight-binding model for monolayer transition metal dichalcogenides in 1T' structure
• Identifying Topological Superconductivity in 2D Transition-Metal Dichalcogenides
• Topological phase transition in MoTe${}_2$: A Review
• Second Harmonic Helicity and Faraday Rotation in Gated Single-Layer 1T${}^{\prime }$-WTe${}_2$
• Theory of Glide Symmetry Protected Helical Edge States in WTe${}_2$ Monolayer
• Higher-order topological superconductivity in monolayer WTe${}_2$ from repulsive interactions
• Low-energy effective theory and anomalous Hall effect in monolayer ${\mathrm{WTe}}_2$
• Rich diversity of crystallographic phase formation in 2D Rex:Mo1-xS2 (x< 0.5) alloy
• Ultrafast Carrier Dynamics in Two-Dimensional Electron Gas-Like K-doped MoS2
• Thermal robustness of the quantum spin Hall phase in monolayer WTe${}_2$
• Role of interface hybridization on induced superconductivity in 1T${}^{\prime }$-WTe${}_2$ and 2H-NbSe${}_2$ heterostructures
• Effects of Strain-Induced Pseudogauge Fields on Exciton Dispersion, Transport, and Interactions in Transition Metal Dichalcogenides Nanoribbons
• Nonlinear orbital response across topological phase transition in centrosymmetric materials