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Moll PJ, Potter AC, Nair NL, et al. Magnetic torque anomaly in the quantum limit of Weyl semimetals. Nat Commun. 2016;7:12492doi: 10.1038/ncomms12492.
Moll, P. J., Potter, A. C., Nair, N. L., Ramshaw, B. J., Modic, K. A., Riggs, S., Zeng, B., Ghimire, N. J., Bauer, E. D., Kealhofer, R., Ronning, F., & Analytis, J. G. (2016). Magnetic torque anomaly in the quantum limit of Weyl semimetals. Nature communications, 712492. https://doi.org/10.1038/ncomms12492
Moll, Philip J W, et al. "Magnetic torque anomaly in the quantum limit of Weyl semimetals." Nature communications vol. 7 (2016): 12492. doi: https://doi.org/10.1038/ncomms12492
Moll PJ, Potter AC, Nair NL, Ramshaw BJ, Modic KA, Riggs S, Zeng B, Ghimire NJ, Bauer ED, Kealhofer R, Ronning F, Analytis JG. Magnetic torque anomaly in the quantum limit of Weyl semimetals. Nat Commun. 2016 Aug 22;7:12492. doi: 10.1038/ncomms12492. PMID: 27545105; PMCID: PMC4996949.
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Nat Commun. 2016 Aug 22;7:12492. doi: 10.1038/ncomms12492.

Magnetic torque anomaly in the quantum limit of Weyl semimetals.

Nature communications

Philip J W Moll, Andrew C Potter, Nityan L Nair, B J Ramshaw, K A Modic, Scott Riggs, Bin Zeng, Nirmal J Ghimire, Eric D Bauer, Robert Kealhofer, Filip Ronning, James G Analytis

Affiliations

  1. Department of Physics, University of California Berkeley, 359 Birge Hall, Berkeley, California 94720, USA.
  2. Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, Dresden 01187, Germany.
  3. National High Magnetic Field Laboratory, TA-35, Los Alamos, New Mexico 87545, USA.
  4. National High Magnetic Field Laboratory, 1800 E. Paul Dirac Dr., Tallahassee, Florida 32310, USA.
  5. Los Alamos National Laboratory, TA-3, Los Alamos, New Mexico 87545, USA.

PMID: 27545105 PMCID: PMC4996949 DOI: 10.1038/ncomms12492

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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