Hybrid-order topological phase and transition in 1H transition metal compounds

被引：0
作者：
Yang, Ning-Jing [1 ,2 ]
Huang, Zhigao [1 ,2 ]
Zhang, Jian-Min [1 ,2 ]
机构：
[1] Fujian Normal Univ, Coll Phys & Energy, Fujian Prov Key Lab Quantum Manipulat & New Energy, Fuzhou 350117, Peoples R China
[2] Fujian Prov Collaborat Innovat Ctr Adv High Field, Fuzhou 350117, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2024年 / 125卷 / 26期
基金：
中国国家自然科学基金;
关键词：
SUPERCONDUCTIVITY; INSULATOR; BULK; BAND; MONOLAYERS; STATES;
D O I：
10.1063/5.0238775
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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.
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页数：6
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