Visualizing the chiral anomaly in Dirac and Weyl semimetals with photoemission spectroscopy

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Behrends, Jan Grushin, Adolfo G. Ojanen, Teemu Bardarson, Jens H. 2018-08-08T10:00:21Z 2018-08-08T10:00:21Z 2016-02-08
dc.identifier.citation Behrends , J , Grushin , A G , Ojanen , T & Bardarson , J H 2016 , ' Visualizing the chiral anomaly in Dirac and Weyl semimetals with photoemission spectroscopy ' PHYSICAL REVIEW B , vol 93 , no. 7 , 075114 . DOI: 10.1103/PhysRevB.93.075114 en
dc.identifier.issn 1098-0121
dc.identifier.issn 1550-235X
dc.identifier.other PURE UUID: 2dc436c5-9b95-4395-93a5-0419112c1e32
dc.identifier.other PURE ITEMURL:
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dc.description.abstract Quantum anomalies are the breaking of a classical symmetry by quantum fluctuations. They dictate how physical systems of diverse nature, ranging from fundamental particles to crystalline materials, respond topologically to external perturbations, insensitive to local details. The anomaly paradigm was triggered by the discovery of the chiral anomaly that contributes to the decay of pions into photons and influences the motion of superfluid vortices in He3-A. In the solid state, it also fundamentally affects the properties of topological Weyl and Dirac semimetals, recently realized experimentally. In this work we propose that the most identifying consequence of the chiral anomaly, the charge density imbalance between fermions of different chirality induced by nonorthogonal electric and magnetic fields, can be directly observed in these materials with the existing technology of photoemission spectroscopy. With angle resolution, the chiral anomaly is identified by a characteristic note-shaped pattern of the emission spectra, originating from the imbalanced occupation of the bulk states and a previously unreported momentum dependent energy shift of the surface state Fermi arcs. We further demonstrate that the chiral anomaly likewise leaves an imprint in angle averaged emission spectra, facilitating its experimental detection. Thereby, our work provides essential theoretical input to foster the direct visualization of the chiral anomaly in condensed matter, in contrast to transport properties, such as negative magnetoresistance, which can also be obtained in the absence of a chiral anomaly. en
dc.format.extent 10
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries PHYSICAL REVIEW B en
dc.relation.ispartofseries Volume 93, issue 7 en
dc.rights openAccess en
dc.subject.other Condensed Matter Physics en
dc.subject.other Electronic, Optical and Magnetic Materials en
dc.subject.other 114 Physical sciences en
dc.title Visualizing the chiral anomaly in Dirac and Weyl semimetals with photoemission spectroscopy en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Max-Planck-Institut für Physik Komplexer Systeme
dc.contributor.department Department of Applied Physics
dc.subject.keyword Condensed Matter Physics
dc.subject.keyword Electronic, Optical and Magnetic Materials
dc.subject.keyword 114 Physical sciences
dc.identifier.urn URN:NBN:fi:aalto-201808084452
dc.identifier.doi 10.1103/PhysRevB.93.075114
dc.type.version publishedVersion

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