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

• URL: http://arxiv.org/abs/2409.13258v1
• Date: Fri, 20 Sep 2024 06:45:00 GMT
• Title: Hybrid-Order Topological Phase And Transition in 1H Transition Metal Compounds
• Authors: Ning-Jing Yang, Zhigao Huang, Jian-Min Zhang,
• Abstract summary: We predict hybrid-order topological insulators (HOTIs) in 1H transition metal compounds. Our finding reveal novel hybrid-order topological phase in 2D electron materials and highlight spintronic applications.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Inspired by recent experimental observations of hybrid topological states [Nature 628, 527 (2024)], we predict hybrid-order topological insulators (HOTIs) in 1H transition metal compounds (TMCs), where both second-order and first-order topological states coexist near the Fermi level. Initially, 1H-TMCs exhibit a second-order topological phase due to the d-orbital band gap. Upon coupling of p- and d- orbitals couple, first-order topological characteristics emerge. This hybrid-order topological phase transition is tunable via crystal field effects. Combined with first-principles calculations, we illustrate the phase transition with WTe2 and NbSe2. In addition, the first-order topological band gap of the HOTI exhibits a strong spin Hall effect. Our finding reveal novel hybrid-order topological phase in 2D electron materials and highlight spintronic applications.

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