Even–odd layer-dependent magnetotransport of high-mobility Q-valley electrons in transition metal disulfides

نویسندگان

  • Zefei Wu
  • Shuigang Xu
  • Huanhuan Lu
  • Armin Khamoshi
  • Gui-Bin Liu
  • Tianyi Han
  • Yingying Wu
  • Jiangxiazi Lin
  • Gen Long
  • Yuheng He
  • Yuan Cai
  • Yugui Yao
  • Fan Zhang
  • Ning Wang
چکیده

In few-layer transition metal dichalcogenides (TMDCs), the conduction bands along the ΓK directions shift downward energetically in the presence of interlayer interactions, forming six Q valleys related by threefold rotational symmetry and time reversal symmetry. In even layers, the extra inversion symmetry requires all states to be Kramers degenerate; whereas in odd layers, the intrinsic inversion asymmetry dictates the Q valleys to be spin-valley coupled. Here we report the transport characterization of prominent Shubnikov-de Hass (SdH) oscillations and the observation of the onset of quantum Hall plateaus for the Q-valley electrons in few-layer TMDCs. Universally in the SdH oscillations, we observe a valley Zeeman effect in all odd-layer TMDC devices and a spin Zeeman effect in all even-layer TMDC devices, which provide a crucial information for understanding the unique properties of multi-valley band structures of few-layer TMDCs.

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عنوان ژورنال:

دوره 7  شماره 

صفحات  -

تاریخ انتشار 2016