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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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Arnold F,Shekhar C,Wu SC,Sun Y,Dos Reis RD,Kumar N,Naumann M,Ajeesh MO,Schmidt M,Grushin AG,Bardarson JH,Baenitz M,Sokolov D,Borrmann H,Nicklas M,Felser C,Hassinger E,Yan B

doi

10.1038/ncomms11615

subject

Has Abstract

pub_date

2016-05-17 00:00:00

pages

11615

issn

2041-1723

pii

ncomms11615

journal_volume

7

pub_type

杂志文章

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