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  Thermodynamic Signatures of Weyl Fermions in NbP

Modic, K. A., Meng, T., Ronning, F., Bauer, E. D., Moll, P. J. W., & Ramshaw, B. J. (2019). Thermodynamic Signatures of Weyl Fermions in NbP. Scientific Reports, 9: 2095. doi:10.1038/s41598-018-38161-7.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-7838-0 Version Permalink: https://hdl.handle.net/21.11116/0000-000B-7839-F
Genre: Journal Article

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https://doi.org/10.1038/s41598-018-38161-7 (Publisher version)
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 Creators:
Modic, K. A.1, Author
Meng, Tobias1, Author
Ronning, Filip1, Author
Bauer, Eric D.1, Author
Moll, Philip J. W.1, Author
Ramshaw, B. J.1, Author
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1external, ou_persistent22              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41598-018-38161-7
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 9 Sequence Number: 2095 Start / End Page: - Identifier: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322