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Optical conductivity of an interacting Weyl liquid in the collisionless regime
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 15, 155117Article in journal (Refereed) Published
Abstract [en]

Optical conductivity (OC) can serve as a measure of correlation effects in a wide range of condensed-matter systems. We show that the long-range tail of the Coulomb interaction yields a universal correction to the OC in a three-dimensional Weyl semimetal sigma(Omega) = sigma(0)(Omega)[1 + 1/N+1], where sigma(0)(Omega) = Ne-0(2)Omega/(12hv) is the OC in the noninteracting system, with v as the actual (renormalized) Fermi velocity of Weyl quasiparticles at frequency Omega, and e(0) is the electron charge in vacuum. Such universal enhancement of OC, which depends only on the number of Weyl nodes near the Fermi level (N), is a remarkable consequence of an intriguing conspiracy among the quantum-critical nature of an interacting Weyl liquid, marginal irrelevance of the long-range Coulomb interaction, and violation of hyperscaling in three dimensions, and can directly be measured in recently discovered Weyl as well as Dirac materials. By contrast, a local density-density interaction produces a nonuniversal correction to the OC, stemming from the nonrenormalizable nature of the corresponding interacting field theory.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 96, no 15, 155117
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-217036DOI: 10.1103/PhysRevB.96.155117ISI: 000412837100003Scopus ID: 2-s2.0-85037683367OAI: oai:DiVA.org:kth-217036DiVA: diva2:1160126
Note

QC 20171124

Available from: 2017-11-24 Created: 2017-11-24 Last updated: 2017-12-20Bibliographically approved

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Juricic, Vladimir

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