4.8 Article

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

Journal

ADVANCED MATERIALS
Volume 28, Issue 24, Pages 4845-4851

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201600100

Keywords

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Funding

  1. National Basic Research Program of China [2013CB921900, 2012CB921300, 2014CB920900]
  2. National Natural Science Foundation of China (NSFC) [11174009, 11274015, 11374021]
  3. Recruitment Program of Global Experts
  4. Beijing Natural Science Foundation [4142024]
  5. Specialized Research Fund for the Doctoral Program of Higher Education of China [20120001110066]
  6. Elemental Strategy Initiative
  7. JSPS

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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.

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