Hybrid-Order Topological Phase And Transition in 1H Transition Metal Compounds

Abstract

Inspired by recent experimental observations of hybrid topological states [Hossain et al. Nature 628, 527 (2024)], we predict hybrid-order topological insulators in 1H transition metal compounds (TMCs), where both second-order and first-order topological (FOT) states coexist near the Fermi level. Initially, 1H-TMCs exhibit a second-order topological phase due to the d orbital bandgap. Upon coupling of p and d orbitals through the crystal field effect, first-order topological characteristics emerge. This hybrid-order topological phase transition can be tuned via crystal field effects. Combined with first-principles calculations, we illustrate the phase transition with WTe2 and NbSe2. The WTe2 exhibits hybrid-order under ambient conditions, while NbSe2 transitions to hybrid-order under pressure. Additionally, the first-order topological bandgap in the HyOTI demonstrates a strong spin Hall effect. Our findings reveal a hybrid-order topological phase in two-dimensional electron materials and underscore spintronic applications.

arXiv comment6 gages, 4 figures

References in corpus (38)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Topological Insulators
• Topological insulators and superconductors
• Higher-Order Topological Insulators
• Electric Multipole Moments, Topological Multipole Moment Pumping, and Chiral Hinge States in Crystalline Insulators
• Two Dimensional Ising Superconductivity in Gated MoS${}_2$
• Quantization of fractional corner charge in $C_n$-symmetric higher-order topological crystalline insulators
• Three-Dimensional Topological Insulators
• Classical higher-order topological insulators
• Exploring 4D Quantum Hall Physics with a 2D Topological Charge Pump
• Topological superconductivity in a van der Waals heterostructure
• Layer Hall effect in a 2D topological Axion antiferromagnet
• Light-induced emergent phenomena in 2D materials and topological materials
• Realization of ideal Weyl semimetal band in ultracold quantum gas with 3D Spin-Orbit coupling
• Tailoring Magnetic Doping in the Topological Insulator Bi2Se3
• Evidence for equilibrium excitons and exciton condensation in monolayer WTe2
• Spin-valley locking in the normal state of a transition-metal dichalocogenide superconductor
• Symmetry-protected hierarchy of anomalous multipole topological band gaps in nonsymmorphic metacrystals
• Hybrid-order topological insulators in a phononic crystal
• Correlation-driven topological and valley states in monolayer VSi${}_2$P${}_4$
• Connecting Higher-Order Topology with the Orbital Hall Effect in Monolayers of Transition Metal Dichalcogenides
• 3D hinge transport in acoustic higher-order topological insulators
• Crystal-field splitting for low symmetry systems in ab initio calculations
• Magnetic field induced localization in 2D topological insulators
• Spin polarized nematic order, quantum valley Hall states, and field tunable topological transitions in twisted multilayer graphene systems
• Discovery of a hybrid topological quantum state in an elemental solid
• Floquet Non-Abelian Topological Insulator and Multifold Bulk-Edge Correspondence
• Ultrafast laser-driven topological spin textures on a 2D magnet
• Topologically-protected metallic states induced by a one-dimensional extended defect in a 2D topological insulator
• Superconductivity in a layered cobalt oxychalcogenide Na${}_2$CoSe${}_2$O with a triangular lattice
• 2D Ladder polyborane: an ideal Dirac semimetal with a multi-feld-tunable band gap
• Bulk-edge correspondence in two-dimensional topological semimetals: A transfer matrix study of antichiral edge modes
• Correlation-driven organic 3D topological insulator with relativistic fermions
• Higher-order topological superconductivity in a topological metal 1T${}^{\prime }$-MoTe${}_2$
• Bulk-Edge Correspondence for Point-Gap Topological Phases in Junction Systems
• Designer topological insulator with enhanced gap and suppressed bulk conduction in Bi2Se3/Sb2Te3 ultra-short period superlattices
• Generalized topological bulk-edge correspondence in bulk-Hermitian continuous systems with non-Hermitian boundary conditions
• Band crossings in honeycomb-layered transition metal compounds

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• Unconventional hybrid-order topological insulators
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