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Strongly angle-dependent magnetoresistance in Weyl semimetals with long-range disorder
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kondenserade materiens teori. Max Planck Institute, Germany.
2017 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, nr 6, artikkel-id 060201Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The chiral anomaly in Weyl semimetals states that the left- and right-handed Weyl fermions, constituting the low energy description, are not individually conserved, resulting, for example, in a negative magnetoresistance in such materials. Recent experiments see strong indications of such an anomalous resistance response; however, with a response that at strong fields is more sharply peaked for parallel magnetic and electric fields than expected from simple theoretical considerations. Here, we uncover a mechanism, arising from the interplay between the angle-dependent Landau-level structure and long-range scalar disorder, that has the same phenomenology. In particular, we analytically show, and numerically confirm, that the internode scattering time decreases exponentially with the angle between the magnetic field and the Weyl node separation in the large field limit, while it is insensitive to this angle at weak magnetic fields. Since, in the simplest approximation, the internode scattering time is proportional to the anomaly-related conductivity, this feature may be related to the experimental observations of a sharply peaked magnetoresistance.

sted, utgiver, år, opplag, sider
American Physical Society, 2017. Vol. 96, nr 6, artikkel-id 060201
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Identifikatorer
URN: urn:nbn:se:kth:diva-212597DOI: 10.1103/PhysRevB.96.060201ISI: 000407318500001Scopus ID: 2-s2.0-85028777867OAI: oai:DiVA.org:kth-212597DiVA, id: diva2:1135935
Forskningsfinansiär
EU, European Research Council, 679722
Merknad

QC 20170824

Tilgjengelig fra: 2017-08-24 Laget: 2017-08-24 Sist oppdatert: 2018-09-19bibliografisk kontrollert

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