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Thermodynamic Signatures of Weyl Fermions in NbP
We present a high magnetic field study of NbP—a member of the monopnictide Weyl semimetal (WSM) family. While the monoarsenides (NbAs and TaAs) have topologically distinct left and right-handed Weyl fermi surfaces, NbP is argued to be “topologically trivial” due to the fact that all pairs of Weyl no...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6375926/ https://www.ncbi.nlm.nih.gov/pubmed/30765755 http://dx.doi.org/10.1038/s41598-018-38161-7 |
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author | Modic, K. A. Meng, Tobias Ronning, Filip Bauer, Eric D. Moll, Philip J. W. Ramshaw, B. J. |
author_facet | Modic, K. A. Meng, Tobias Ronning, Filip Bauer, Eric D. Moll, Philip J. W. Ramshaw, B. J. |
author_sort | Modic, K. A. |
collection | PubMed |
description | We present a high magnetic field study of NbP—a member of the monopnictide Weyl semimetal (WSM) family. While the monoarsenides (NbAs and TaAs) have topologically distinct left and right-handed Weyl fermi surfaces, NbP is argued to be “topologically trivial” due to the fact that all pairs of Weyl nodes are encompassed by a single Fermi surface. We use torque magnetometry to measure the magnetic response of NbP up to 60 tesla and uncover a Berry paramagnetic response, characteristic of the topological Weyl nodes, across the entire field range. At the quantum limit B(*) (≈32 T), τ/B experiences a change in slope when the chemical potential enters the last Landau level. Our calculations confirm that this magnetic response arises from band topology of the Weyl pocket, even though the Fermi surface encompasses both Weyl nodes at zero magnetic field. We also find that the magnetic field pulls the chemical potential to the chiral n = 0 Landau level in the quantum limit, providing a disorder-free way of accessing chiral Weyl fermions in systems that are “not quite” WSMs in zero magnetic field. |
format | Online Article Text |
id | pubmed-6375926 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-63759262019-02-19 Thermodynamic Signatures of Weyl Fermions in NbP Modic, K. A. Meng, Tobias Ronning, Filip Bauer, Eric D. Moll, Philip J. W. Ramshaw, B. J. Sci Rep Article We present a high magnetic field study of NbP—a member of the monopnictide Weyl semimetal (WSM) family. While the monoarsenides (NbAs and TaAs) have topologically distinct left and right-handed Weyl fermi surfaces, NbP is argued to be “topologically trivial” due to the fact that all pairs of Weyl nodes are encompassed by a single Fermi surface. We use torque magnetometry to measure the magnetic response of NbP up to 60 tesla and uncover a Berry paramagnetic response, characteristic of the topological Weyl nodes, across the entire field range. At the quantum limit B(*) (≈32 T), τ/B experiences a change in slope when the chemical potential enters the last Landau level. Our calculations confirm that this magnetic response arises from band topology of the Weyl pocket, even though the Fermi surface encompasses both Weyl nodes at zero magnetic field. We also find that the magnetic field pulls the chemical potential to the chiral n = 0 Landau level in the quantum limit, providing a disorder-free way of accessing chiral Weyl fermions in systems that are “not quite” WSMs in zero magnetic field. Nature Publishing Group UK 2019-02-14 /pmc/articles/PMC6375926/ /pubmed/30765755 http://dx.doi.org/10.1038/s41598-018-38161-7 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Modic, K. A. Meng, Tobias Ronning, Filip Bauer, Eric D. Moll, Philip J. W. Ramshaw, B. J. Thermodynamic Signatures of Weyl Fermions in NbP |
title | Thermodynamic Signatures of Weyl Fermions in NbP |
title_full | Thermodynamic Signatures of Weyl Fermions in NbP |
title_fullStr | Thermodynamic Signatures of Weyl Fermions in NbP |
title_full_unstemmed | Thermodynamic Signatures of Weyl Fermions in NbP |
title_short | Thermodynamic Signatures of Weyl Fermions in NbP |
title_sort | thermodynamic signatures of weyl fermions in nbp |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6375926/ https://www.ncbi.nlm.nih.gov/pubmed/30765755 http://dx.doi.org/10.1038/s41598-018-38161-7 |
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