On the Quantum Spin Hall Gap of Monolayer 1T'-WTe2

Zheng FP; Cai CY; Ge SF; Zhang XF; Liu X; Lu H; Zhang YD; Qiu J; Taniguchi T; Watanabe K; Jia S; Qi JS; Chen JH; Sun D; Feng J

Advanced Materials, Vol.28, No.24, 4845-4851, 2016

DOI10.1002/adma.201600100 Export Citation

On the Quantum Spin Hall Gap of Monolayer 1T'-WTe2

Zheng FP, Cai CY, Ge SF, Zhang XF, Liu X, Lu H, Zhang YD, Qiu J, Taniguchi T, Watanabe K, Jia S, Qi JS, Chen JH, Sun D, Feng J

Positive quantum spin Hall gap in monolayer 1T'-WTe2 is consistently supported by density-functional theory calculations, ultrafast pump-probe, and electrical transport measurements. It is argued that monolayer 1T'-WTe2, which was predicted to be a semimetallic quantum spin Hall material, is likely a truly 2D quantum spin Hall insulator with a positive quantum spin Hall gap.