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Elastic gauge fields and Hall viscosity of Dirac magnons
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 5, article id 054404Article in journal (Refereed) Published
Abstract [en]

We analyze the coupling of elastic lattice deformations to the magnon degrees of freedom of magnon Dirac materials. For a honeycomb ferromagnet we find that, as happens in the case of graphene, elastic gauge fields appear coupled to the magnon pseudospinors. For deformations that induce constant pseudomagnetic fields, the spectrum around the Dirac nodes splits into pseudo-Landau levels. We show that when a Dzyaloshinskii-Moriya interaction is considered, a topological gap opens in the system and a Chern-Simons effective action for the elastic degrees of freedom is generated. Such a term encodes a phonon Hall viscosity response, entirely generated by quantum fluctuations of magnons living in the vicinity of the Dirac points. The magnon Hall viscosity vanishes at zero temperature, and grows as temperature is raised and the states around the Dirac points are increasingly populated.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 5, article id 054404
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-218778DOI: 10.1103/PhysRevB.97.054404ISI: 000424087600002Scopus ID: 2-s2.0-85042182527OAI: oai:DiVA.org:kth-218778DiVA, id: diva2:1161505
Note

QC 20180216

Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2018-02-16Bibliographically approved

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