Quantum spin Hall insulator phase in monolayer WTe2by uniaxial strain | Zendy

Hui Xiang | Zendy; Bo Xu | Zendy; Jinqiu Liu | Zendy; Yidong Xia | Zendy; Haiming Lu | Zendy; Jiang Yin | Zendy; Zhiguo Liu | Zendy

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Quantum spin Hall insulator phase in monolayer WTe₂by uniaxial strain

Author(s) -

Hui Xiang,

Bo Xu,

Jinqiu Liu,

Yidong Xia,

Haiming Lu,

Jiang Yin,

Zhiguo Liu

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4962662

Subject(s) - monolayer , condensed matter physics , semimetal , insulator (electricity) , materials science , spin (aerodynamics) , phase (matter) , band gap , physics , nanotechnology , optoelectronics , quantum mechanics , thermodynamics

Monolayer WTe2, which is predicted to be large-gap quantum spin Hall (QSH) insulators with distorted 1T (1T’) structure, attracts rapidly growing interests. However, the intrinsic semimetallic nature of the monolayer 1T’-WTe2 limits their direct applications based on QSH effect. By first-principles density functional theoretical calculations, we demonstrate a phase transition from semimetal to QSH insulator under the uniaxial strains along a and b axis in monolayer 1T’-WTe2. The electronic phase transition results from the geometric structure deformation upon the uniaxial strains. This suggests monolayer 1T’-WTe2 as a promising material for application in strain-tunable topological quantum electronics

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