期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/ncomms12955
关键词
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资金
- Research Grants Council of Hong Kong [16302215, HKU9/CRF/13G, 604112, N_HKUST613/12]
- UT Dallas Research Enhancement Funds
- UT Dallas Undergraduate Research Scholar Awards
- National Science Foundation [PHY11-25915]
- NSFC of China [11304014]
- 973 Program of China [2013CB934500]
- MOST Project of China [2014CB920903, 2016YFA0300603]
- National Natural Science Foundation of China [11574029, 11225418]
In few-layer transition metal dichalcogenides (TMDCs), the conduction bands along the GK 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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