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On the Quantum Spin Hall Gap of Monolayer 1T′‐WTe 2

2016; Volume: 28; Issue: 24 Linguagem: Inglês

10.1002/adma.201600100

1521-4095

Feipeng Zheng, Chao-Yi Cai, Shaofeng Ge, Xuefeng Zhang, Xin Liu, Hong Lu, Yudao Zhang, Jun Qiu, Takashi Taniguchi, Kenji Watanabe, Shuang Jia, Jingshan Qi, Jianhao Chen, Dong Sun, Ji Feng,

Graphene research and applications

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.