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Ultrahigh conductivity in Weyl semimetal NbAs nanobelts.

  • Zhang C State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
  • Ni Z State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
  • Zhang J Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei, China.
  • Yuan X State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
  • Liu Y State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
  • Zou Y Materials Engineering, The University of Queensland, Brisbane, Queensland, Australia.
  • Liao Z Materials Engineering, The University of Queensland, Brisbane, Queensland, Australia.
  • Du Y Department of Applied Physics and Institution of Energy and Microstructure, Nanjing University of Science and Technology, Nanjing, China.
  • Narayan A Materials Theory, ETH Zurich, Zurich, Switzerland.
  • Zhang H State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
  • Gu T State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
  • Zhu X State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
  • Pi L Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei, China.
  • Sanvito S School of Physics and CRANN Institute, Trinity College, Dublin, Ireland.
  • Han X Beijing Key Laboratory and Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, China.
  • Zou J Materials Engineering, The University of Queensland, Brisbane, Queensland, Australia.
  • Shi Y Collaborative Innovation Center of Advanced Microstructures, Nanjing, China.
  • Wan X Collaborative Innovation Center of Advanced Microstructures, Nanjing, China.
  • Savrasov SY Department of Physics, University of California, Davis, Davis, CA, USA.
  • Xiu F State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China. Faxian@fudan.edu.cn.
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  • 2019-03-20
Published in:
  • Nature materials. - 2019
Mechanical Engineering
General Materials Science
Mechanics of Materials
General Chemistry
Condensed Matter Physics
English In two-dimensional (2D) systems, high mobility is typically achieved in low-carrier-density semiconductors and semimetals. Here, we discover that the nanobelts of Weyl semimetal NbAs maintain a high mobility even in the presence of a high sheet carrier density. We develop a growth scheme to synthesize single crystalline NbAs nanobelts with tunable Fermi levels. Owing to a large surface-to-bulk ratio, we argue that a 2D surface state gives rise to the high sheet carrier density, even though the bulk Fermi level is located near the Weyl nodes. A surface sheet conductance up to 5-100 S per □ is realized, exceeding that of conventional 2D electron gases, quasi-2D metal films, and topological insulator surface states. Corroborated by theory, we attribute the origin of the ultrahigh conductance to the disorder-tolerant Fermi arcs. The evidenced low-dissipation property of Fermi arcs has implications for both fundamental study and potential electronic applications.
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  • English
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green
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https://folia.unifr.ch/global/documents/37631
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