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Mixed Axial-Torsional Anomaly in Weyl Semimetals
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 5, article id 056601Article in journal (Refereed) Published
Abstract [en]

We show that Weyl semimetals exhibit a mixed axial-torsional anomaly in the presence of axial torsion, a concept exclusive of these materials with no known natural fundamental interpretation in terms of the geometry of spacetime. This anomaly implies a nonconservation of the axial current - the difference in the current of left- and right-handed chiral fermions - when the torsion of the spacetime in which the Weyl fermions move couples with opposite sign to different chiralities. The anomaly is activated by driving transverse sound waves through a Weyl semimetal with a spatially varying tilted dispersion, which can be engineered by applying strain. This leads to a sizable alternating current in the presence of a magnetic field that provides a clear-cut experimental signature of our predictions.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 122, no 5, article id 056601
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-244328DOI: 10.1103/PhysRevLett.122.056601ISI: 000458149700012Scopus ID: 2-s2.0-85061294713OAI: oai:DiVA.org:kth-244328DiVA, id: diva2:1294025
Funder
Knut and Alice Wallenberg Foundation, 2013-0093Swedish Research Council
Note

QC 20190306

Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-03-06Bibliographically approved

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Ferreiros, YagoKedem, Yaron

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