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Odd-Integer Quantum Hall States and Giant Spin Susceptibility in p-Type Few-Layer WSe2

Shuigang Xu, Junying Shen, Gen Long, Zefei Wu, Zhi-qiang Bao, Cheng-Cheng Liu, Xiao Xiao, Tianyi Han, Jiangxiazi Lin, Yingying Wu, Huanhuan Lu, Jianqiang Hou, Liheng An, Yuanwei Wang, Yuan Cai, K. M. Ho, Yuheng He, Rolf Lortz, Fan Zhang, and Ning Wang
Phys. Rev. Lett. 118, 067702 – Published 10 February 2017
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Abstract

We fabricate high-mobility p-type few-layer WSe2 field-effect transistors and surprisingly observe a series of quantum Hall (QH) states following an unconventional sequence predominated by odd-integer states under a moderate strength magnetic field. By tilting the magnetic field, we discover Landau level crossing effects at ultralow coincident angles, revealing that the Zeeman energy is about 3 times as large as the cyclotron energy near the valence band top at the Γ valley. This result implies the significant roles played by the exchange interactions in p-type few-layer WSe2, in which itinerant or QH ferromagnetism likely occurs. Evidently, the Γ valley of few-layer WSe2 offers a unique platform with unusually heavy hole carriers and a substantially enhanced g factor for exploring strongly correlated phenomena.

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  • Received 3 November 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.067702

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shuigang Xu1, Junying Shen1, Gen Long1, Zefei Wu1, Zhi-qiang Bao2, Cheng-Cheng Liu2, Xiao Xiao1, Tianyi Han1, Jiangxiazi Lin1, Yingying Wu1, Huanhuan Lu1, Jianqiang Hou1, Liheng An1, Yuanwei Wang1, Yuan Cai1, K. M. Ho1, Yuheng He1, Rolf Lortz1, Fan Zhang2,†, and Ning Wang1,*

  • 1Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
  • 2Department of Physics, University of Texas at Dallas, Richardson, Texas 75080, USA

  • *Corresponding author. phwang@ust.hk
  • Corresponding author. zhang@utdallas.edu

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Issue

Vol. 118, Iss. 6 — 10 February 2017

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