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Mixed Axial-Torsional Anomaly in Weyl Semimetals
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Rekke forfattare: 42019 (engelsk)Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, nr 5, artikkel-id 056601Artikkel i tidsskrift (Fagfellevurdert) 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.

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2019. Vol. 122, nr 5, artikkel-id 056601
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URN: urn:nbn:se:su:diva-166537DOI: 10.1103/PhysRevLett.122.056601ISI: 000458149700012OAI: oai:DiVA.org:su-166537DiVA, id: diva2:1293996
Tilgjengelig fra: 2019-03-06 Laget: 2019-03-06 Sist oppdatert: 2019-03-06bibliografisk kontrollert

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