skip to main content

DOE PAGESDOE PAGES

Title: Magnetic torque anomaly in the quantum limit of Weyl semimetals

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.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ; ORCiD logo [5] ;  [6] ; ORCiD logo [6] ;  [2] ;  [6] ;  [2]
  1. Univ. of California, Berkeley, CA (United States); Max-Planck-Institute for Chemical Physics of Solids, Dresden (Germany)
  2. Univ. of California, Berkeley, CA (United States)
  3. National High Magnetic Field Laboratory, Los Alamos, NM (United States)
  4. Max-Planck-Institute for Chemical Physics of Solids, Dresden (Germany); National High Magnetic Field Laboratory, Los Alamos, NM (United States)
  5. National High Magnetic Field Laboratory, Tallahassee, FL (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-22971
Journal ID: ISSN 2041-1723
Grant/Contract Number:
AC52-06NA25396; SC0002613
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 36 MATERIALS SCIENCE; Material Science; Torque; Weyl semimetal; quantum limit
OSTI Identifier:
1414110

Moll, Philip J. W., Potter, Andrew C., Nair, Nityan L., Ramshaw, B. J., Modic, K. A., Riggs, Scott, Zeng, Bin, Ghimire, Nirmal J., Bauer, Eric D., Kealhofer, Robert, Ronning, Filip, and Analytis, James G.. Magnetic torque anomaly in the quantum limit of Weyl semimetals. United States: N. p., Web. doi:10.1038/ncomms12492.
Moll, Philip J. W., Potter, Andrew C., Nair, Nityan L., Ramshaw, B. J., Modic, K. A., Riggs, Scott, Zeng, Bin, Ghimire, Nirmal J., Bauer, Eric D., Kealhofer, Robert, Ronning, Filip, & Analytis, James G.. Magnetic torque anomaly in the quantum limit of Weyl semimetals. United States. doi:10.1038/ncomms12492.
Moll, Philip J. W., Potter, Andrew C., Nair, Nityan L., Ramshaw, B. J., Modic, K. A., Riggs, Scott, Zeng, Bin, Ghimire, Nirmal J., Bauer, Eric D., Kealhofer, Robert, Ronning, Filip, and Analytis, James G.. 2016. "Magnetic torque anomaly in the quantum limit of Weyl semimetals". United States. doi:10.1038/ncomms12492. https://www.osti.gov/servlets/purl/1414110.
@article{osti_1414110,
title = {Magnetic torque anomaly in the quantum limit of Weyl semimetals},
author = {Moll, Philip J. W. and Potter, Andrew C. and Nair, Nityan L. and Ramshaw, B. J. and Modic, K. A. and Riggs, Scott and Zeng, Bin and Ghimire, Nirmal J. and Bauer, Eric D. and Kealhofer, Robert and Ronning, Filip and Analytis, James G.},
abstractNote = {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.},
doi = {10.1038/ncomms12492},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {8}
}

Works referenced in this record:

Graphene: Status and Prospects
journal, June 2009