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  Magnetic torque anomaly in the quantum limit of Weyl semimetals

Moll, P. J. W., Potter, A. C., Nair, N. L., Ramshaw, B. J., Modic, K. A., Riggs, S., et al. (2016). Magnetic torque anomaly in the quantum limit of Weyl semimetals. Nature Communications, 7: 12492. doi:10.1038/ncomms12492.

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https://doi.org/10.1038/ncomms12492 (Publisher version)
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 Creators:
Moll, Philip J. W.1, Author
Potter, Andrew C.1, Author
Nair, Nityan L.1, Author
Ramshaw, B. J.1, Author
Modic, K. A.1, Author
Riggs, Scott1, Author
Zeng, Bin1, Author
Ghimire, Nirmal J.1, Author
Bauer, Eric D.1, Author
Kealhofer, Robert1, Author
Ronning, Filip1, Author
Analytis, James G.1, Author
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1external, ou_persistent22              

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 Abstract: Electrons in materials with linear dispersion behave as massless Weyl- or Dirac-quasiparticles, and continue to intrigue due to their close resemblance to elusive ultra-relativistic particles as well as their potential for future electronics. Yet the experimental signatures of Weyl-fermions are often subtle and indirect, in particular if they coexist with conventional, massive quasiparticles. Here we show a pronounced anomaly in the magnetic torque of the Weyl semimetal NbAs upon entering the quantum limit state in high magnetic fields. The torque changes sign in the quantum limit, signalling a reversal of the magnetic anisotropy that can be directly attributed to the topological nature of the Weyl electrons. Our results establish that anomalous quantum limit torque measurements provide a direct experimental method to identify and distinguish Weyl and Dirac systems.

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Language(s): eng - English
 Dates: 2016
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/ncomms12492
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 7 Sequence Number: 12492 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723