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  Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP

Arnold, F., Shekhar, C., Wu, S.-C., Sun, Y., dos Reis, R. D., Kumar, N., et al. (2016). Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP. Nature Communications, 7: 11615. doi:10.1038/ncomms11615.

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Arnold, Frank1, Author
Shekhar, Chandra1, Author
Wu, Shu-Chun1, Author
Sun, Yan1, Author
dos Reis, Ricardo Donizeth1, Author
Kumar, Nitesh1, Author
Naumann, Marcel1, Author
Ajeesh, Mukkattu O.1, Author
Schmidt, Marcus1, Author
Grushin, Adolfo G.2, Author           
Bardarson, Jens H.2, Author           
Baenitz, Michael1, Author
Sokolov, Dmitry1, Author
Borrmann, Horst1, Author
Nicklas, Michael1, Author
Felser, Claudia1, Author
Hassinger, Elena1, Author
Yan, Binghai2, Author           
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1external, ou_persistent22              
2Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              

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 MPIPKS: Electronic structure
 Abstract: Weyl semimetals (WSMs) are topological quantum states wherein the electronic bands disperse linearly around pairs of nodes with fixed chirality, the Weyl points. In WSMs, nonorthogonal electric and magnetic fields induce an exotic phenomenon known as the chiral anomaly, resulting in an unconventional negative longitudinal magnetoresistance, the chiral-magnetic effect. However, it remains an open question to which extent this effect survives when chirality is not well-defined. Here, we establish the detailed Fermi-surface topology of the recently identified WSM TaP via combined angle-resolved quantum-oscillation spectra and band-structure calculations. The Fermi surface forms banana-shaped electron and hole pockets surrounding pairs of Weyl points. Although this means that chirality is ill-defined in TaP, we observe a large negative longitudinal magnetoresistance. We show that the magnetoresistance can be affected by a magnetic field-induced inhomogeneous current distribution inside the sample.

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 Dates: 2016-05-172016-05-17
 Publication Status: Issued
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 Identifiers: DOI: 10.1038/ncomms11615
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 7 Sequence Number: 11615 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723