Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP
Arnold F, Shekhar C, Wu SC, Sun Y, Dos Reis RD, Kumar N, Naumann M, Ajeesh MO, Schmidt M, Grushin AG, Bardarson JH, Baenitz M, Sokolov D, Borrmann H, Nicklas M, Felser C, Hassinger E, Yan B (2016)
Publication Type: Journal article
Publication year: 2016
Journal
Book Volume: 7
Article Number: 11615
DOI: 10.1038/ncomms11615
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.
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Max-Planck-Institut für Physik komplexer Systeme (MPI PKS) / Max Planck Institute for the Physics of Complex Systems
Germany (DE)
Germany (DE)
Max-Planck-Institut für Physik komplexer Systeme (MPI PKS) / Max Planck Institute for the Physics of Complex Systems
Germany (DE)
How to cite
APA:
Arnold, F., Shekhar, C., Wu, S.-C., Sun, Y., Dos Reis, R.D., Kumar, N.,... Yan, B. (2016). Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP. Nature Communications, 7. https://doi.org/10.1038/ncomms11615
MLA:
Arnold, Frank, et al. "Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP." Nature Communications 7 (2016).
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