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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...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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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. |
format | Online Article Text |
id | pubmed-4895157 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
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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