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Anomalous electronic structure and magnetoresistance in TaAs(2)

The change in resistance of a material in a magnetic field reflects its electronic state. In metals with weakly- or non-interacting electrons, the resistance typically increases upon the application of a magnetic field. In contrast, negative magnetoresistance may appear under some circumstances, e.g...

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Autores principales: Luo, Yongkang, McDonald, R. D., Rosa, P. F. S., Scott, B., Wakeham, N., Ghimire, N. J., Bauer, E. D., Thompson, J. D., Ronning, F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4895157/
https://www.ncbi.nlm.nih.gov/pubmed/27271852
http://dx.doi.org/10.1038/srep27294
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author Luo, Yongkang
McDonald, R. D.
Rosa, P. F. S.
Scott, B.
Wakeham, N.
Ghimire, N. J.
Bauer, E. D.
Thompson, J. D.
Ronning, F.
author_facet Luo, Yongkang
McDonald, R. D.
Rosa, P. F. S.
Scott, B.
Wakeham, N.
Ghimire, N. J.
Bauer, E. D.
Thompson, J. D.
Ronning, F.
author_sort Luo, Yongkang
collection PubMed
description The change in resistance of a material in a magnetic field reflects its electronic state. In metals with weakly- or non-interacting electrons, the resistance typically increases upon the application of a magnetic field. In contrast, negative magnetoresistance may appear under some circumstances, e.g., in metals with anisotropic Fermi surfaces or with spin-disorder scattering and semimetals with Dirac or Weyl electronic structures. Here we show that the non-magnetic semimetal TaAs(2) possesses a very large negative magnetoresistance, with an unknown scattering mechanism. Density functional calculations find that TaAs(2) is a new topological semimetal [ℤ(2) invariant (0;111)] without Dirac dispersion, demonstrating that a negative magnetoresistance in non-magnetic semimetals cannot be attributed uniquely to the Adler-Bell-Jackiw chiral anomaly of bulk Dirac/Weyl fermions.
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spelling pubmed-48951572016-06-10 Anomalous electronic structure and magnetoresistance in TaAs(2) Luo, Yongkang McDonald, R. D. Rosa, P. F. S. Scott, B. Wakeham, N. Ghimire, N. J. Bauer, E. D. Thompson, J. D. Ronning, F. Sci Rep Article The change in resistance of a material in a magnetic field reflects its electronic state. In metals with weakly- or non-interacting electrons, the resistance typically increases upon the application of a magnetic field. In contrast, negative magnetoresistance may appear under some circumstances, e.g., in metals with anisotropic Fermi surfaces or with spin-disorder scattering and semimetals with Dirac or Weyl electronic structures. Here we show that the non-magnetic semimetal TaAs(2) possesses a very large negative magnetoresistance, with an unknown scattering mechanism. Density functional calculations find that TaAs(2) is a new topological semimetal [ℤ(2) invariant (0;111)] without Dirac dispersion, demonstrating that a negative magnetoresistance in non-magnetic semimetals cannot be attributed uniquely to the Adler-Bell-Jackiw chiral anomaly of bulk Dirac/Weyl fermions. Nature Publishing Group 2016-06-07 /pmc/articles/PMC4895157/ /pubmed/27271852 http://dx.doi.org/10.1038/srep27294 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Luo, Yongkang
McDonald, R. D.
Rosa, P. F. S.
Scott, B.
Wakeham, N.
Ghimire, N. J.
Bauer, E. D.
Thompson, J. D.
Ronning, F.
Anomalous electronic structure and magnetoresistance in TaAs(2)
title Anomalous electronic structure and magnetoresistance in TaAs(2)
title_full Anomalous electronic structure and magnetoresistance in TaAs(2)
title_fullStr Anomalous electronic structure and magnetoresistance in TaAs(2)
title_full_unstemmed Anomalous electronic structure and magnetoresistance in TaAs(2)
title_short Anomalous electronic structure and magnetoresistance in TaAs(2)
title_sort anomalous electronic structure and magnetoresistance in taas(2)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4895157/
https://www.ncbi.nlm.nih.gov/pubmed/27271852
http://dx.doi.org/10.1038/srep27294
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