Surface charge induced Dirac band splitting in a charge density wave material (TaSe4)2I

  title={Surface charge induced Dirac band splitting in a charge density wave material 
  author={Hemian Yi and Zengle Huang and Wujun Shi and Lujin Min and Rui Wu and Craig Polley and Ruoxi Zhang and Yi-Fan Zhao and Ling Zhou and Johan Adell and Xin Gui and Weiwei Xie and Moses H. W. Chan and Zhiqiang Mao and Zhijun Wang and Weida Wu and Cui-Zu Chang},
  journal={arXiv: Strongly Correlated Electrons},
(TaSe4)2I, a quasi-one-dimensional (1D) crystal, shows a characteristic temperature-driven metal-insulator phase transition. Above the charge density wave (CDW) temperature Tc, (TaSe4)2I has been predicted to harbor a Weyl semimetal phase. Below Tc, it becomes an axion insulator. Here, we perform angle-resolved photoemission spectroscopy (ARPES) measurements on the (110) surface of (TaSe4)2I and observe two sets of Dirac-like energy bands in the first Brillion zone, which agree well with our… 

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1. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China 2. Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China 3. Shanghai high


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