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

MPS-Authors
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Arnold,  Frank
Physics of Unconventional Metals and Superconductors, 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;

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

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

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

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

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Naumann,  Marcel
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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

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

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

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

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

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

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

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Hassinger,  Elena
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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

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Citation

Arnold, F., Shekhar, C., Wu, S.-C., Sun, Y., Donizeth dos Reis, R., Kumar, N., et al. (2016). Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP. Nature Communications, 7: 11615, pp. 1-7. doi:10.1038/ncomms11615.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-8100-D
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.