title: Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP.
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.
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Arnold
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Chandra
authors.initials: C
authors.lastname: Shekhar
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Shu-Chun
authors.initials: SC
authors.lastname: Wu
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Yan
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Ricardo Donizeth
authors.identifier: 0000-0002-2212-4173
authors.initials: RD
authors.lastname: Dos Reis
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Nitesh
authors.initials: N
authors.lastname: Kumar
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Marcel
authors.initials: M
authors.lastname: Naumann
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Mukkattu O
authors.initials: MO
authors.lastname: Ajeesh
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Marcus
authors.initials: M
authors.lastname: Schmidt
authors.affiliation: Max Planck Institute for the Physics of Complex Systems, Dresden 01187, Germany.
authors.forename: Adolfo G
authors.initials: AG
authors.lastname: Grushin
authors.affiliation: Max Planck Institute for the Physics of Complex Systems, Dresden 01187, Germany.
authors.forename: Jens H
authors.initials: JH
authors.lastname: Bardarson
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Baenitz
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Dmitry
authors.initials: D
authors.lastname: Sokolov
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Horst
authors.initials: H
authors.lastname: Borrmann
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Michael
authors.identifier: 0000-0001-6272-2162
authors.initials: M
authors.lastname: Nicklas
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Felser
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.
authors.forename: Elena
authors.initials: E
authors.lastname: Hassinger
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany.|Max Planck Institute for the Physics of Complex Systems, Dresden 01187, Germany.
authors.forename: Binghai
authors.identifier: 0000-0003-2164-5839
authors.initials: B
authors.lastname: Yan