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

Frank Arnold, Chandra Shekhar, Shu-Chun Wu, Yan Sun, Ricardo Donizeth dos Reis, Nitesh Kumar, Marcel Naumann, Mukkattu O. Ajeesh, Marcus Schmidt, Adolfo G. Grushin, Jens H. Bardarson, Michael Baenitz, Dmitry Sokolov, Horst Borrmann, Michael Nicklas, Claudia Felser, Elena Hassinger () and Binghai Yan ()
Additional contact information
Frank Arnold: Max Planck Institute for Chemical Physics of Solids
Chandra Shekhar: Max Planck Institute for Chemical Physics of Solids
Shu-Chun Wu: Max Planck Institute for Chemical Physics of Solids
Yan Sun: Max Planck Institute for Chemical Physics of Solids
Ricardo Donizeth dos Reis: Max Planck Institute for Chemical Physics of Solids
Nitesh Kumar: Max Planck Institute for Chemical Physics of Solids
Marcel Naumann: Max Planck Institute for Chemical Physics of Solids
Mukkattu O. Ajeesh: Max Planck Institute for Chemical Physics of Solids
Marcus Schmidt: Max Planck Institute for Chemical Physics of Solids
Adolfo G. Grushin: Max Planck Institute for the Physics of Complex Systems
Jens H. Bardarson: Max Planck Institute for the Physics of Complex Systems
Michael Baenitz: Max Planck Institute for Chemical Physics of Solids
Dmitry Sokolov: Max Planck Institute for Chemical Physics of Solids
Horst Borrmann: Max Planck Institute for Chemical Physics of Solids
Michael Nicklas: Max Planck Institute for Chemical Physics of Solids
Claudia Felser: Max Planck Institute for Chemical Physics of Solids
Elena Hassinger: Max Planck Institute for Chemical Physics of Solids
Binghai Yan: Max Planck Institute for Chemical Physics of Solids

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms11615

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