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

Arnold, Frank; Shekhar, Chandra; Wu, Shu-Chun; Sun, Yan; Donizeth dos Reis, Ricardo; Kumar, Nitesh; Naumann, Marcel; Ajeesh, Mukkattu O.; Schmidt, Marcus; Grushin, Adolfo G.; Bardarson, Jens H.; Baenitz, Michael; Sokolov, Dmitry; Borrmann, Horst; Nicklas, Michael; Felser, Claudia; Hassinger, Elena; Yan, Binghai

doi:10.1038/ncomms11615

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

MPS-Authors

/persons/resource/persons186147

Arnold, Frank
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126847

Shekhar, Chandra
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126914

Wu, Shu-Chun
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons179670

Sun, Yan
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons195509

Donizeth dos Reis, Ricardo
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons195511

Kumar, Nitesh
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons195513

Naumann, Marcel
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons195517

Ajeesh, Mukkattu O.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126835

Schmidt, Marcus
Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126528

Baenitz, Michael
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons195519

Sokolov, Dmitry
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126541

Borrmann, Horst
Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126782

Nicklas, Michael
Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126601

Felser, Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons186149

Hassinger, Elena
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126916

Yan, Binghai
Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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引用

Arnold, F., Shekhar, C., Wu, S.-C., Sun, Y., Donizeth dos Reis, R., Kumar, N., Naumann, M., Ajeesh, M. O., Schmidt, M., Grushin, A. G., Bardarson, J. H., Baenitz, M., Sokolov, D., Borrmann, H., Nicklas, M., Felser, C., Hassinger, E., & Yan, B. (2016). Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP. Nature Communications, 7:, pp. 1- 7. doi:10.1038/ncomms11615.

引用: https://hdl.handle.net/11858/00-001M-0000-002A-8100-D

要旨

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.