On the Quantum Spin Hall Gap of Monolayer 1T′-WTe2

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• 作者：Feipeng Zheng ; Chaoyi Cai ; Shaofeng Ge ; Xuefeng Zhang ; Xin Liu ; Hong Lu ; Yudao Zhang ; Jun Qiu ; Takashi Taniguchi ; Kenji Watanabe ; Shuang Jia ; Jingshan Qi ; Jian-Hao Chen ; Dong Sun and Ji Feng
• 刊名：Advanced Materials
• 出版年：2016
• 出版时间：June 22, 2016
• 年：2016
• 卷：28
• 期：24
• 页码：4845-4851
• 全文大小：1921K
• ISSN：1521-4095

文摘

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.