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

Frank Arnold; Chandra Shekhar; Shu-Chun Wu; Yan Sun; Reis, 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; Binghai Yan

doi:10.1038/ncomms11615

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

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

Frank Arnold, Chandra Shekhar, Shu-Chun Wu, Yan Sun, Reis, Ricardo Donizeth dos Reis, Nitesh Kumar, Marcel Naumann, Mukkattu O. Ajeesh, Marcus Schmidt, Adolfo G. Grushin, …

Nature Communications, Vol.7, 11615

May/2016

DOI: https://doi.org/10.1038/ncomms11615

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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.

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Title: Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP
Creators: Frank Arnold (null)
Chandra Shekhar (null)
Shu-Chun Wu (null)
Yan Sun (null)
Reis, Ricardo Donizeth dos Reis (null)
Nitesh Kumar (null)
Marcel Naumann (null)
Mukkattu O. Ajeesh (null)
Marcus Schmidt (null)
Adolfo G. Grushin (null)
Jens H. Bardarson (null)
Michael Baenitz (null)
Dmitry Sokolov (null)
Horst Borrmann (null)
Michael Nicklas (null)
Claudia Felser (null)
Elena Hassinger (null)
Binghai Yan (null) - The Weizmann Institute of Science
Resource Type: Journal article
Publication Details: Nature Communications, Vol.7, 11615; May/2016
Number of pages: 7
Language: English
DOI: https://doi.org/10.1038/ncomms11615
Grant note: Deutsche Forschungsgemein- schaft DFG (of DFG-SPP 1666 Topological Insulators) [EB 518/1-1]; Deutsche Forschungsgemein- schaft DFG [SFB 1143]; ERC [291472]; Brazilian agency CNPq_ALMAME_DELIMITER_
Scientific Unit: The Weizmann Institute of Science
Record Identifier: 993264845703596

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