Universal optical conductivity of a disordered Weyl semimetal
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 32446Article in journal (Refereed) Published
Topological Weyl semimetals, besides manifesting chiral anomaly, can also accommodate a disorder-driven unconventional quantum phase transition into a metallic phase. A fundamentally and practically important question in this regard concerns an experimentally measurable quantity that can clearly distinguish these two phases. We show that the optical conductivity while serving this purpose can also play the role of a bonafide order parameter across such disorder-driven semimetal-metal quantum phase transition by virtue of displaying distinct scaling behavior in the semimetallic and metallic phases, as well as inside the quantum critical fan supporting a non-Fermi liquid. We demonstrate that the correction to the dielectric constant and optical conductivity in a dirty Weyl semimetal due to weak disorder is independent of the actual nature of point-like impurity scatterers. Therefore, optical conductivity can be used as an experimentally measurable quantity to study the critical properties and to pin the universality class of the disorder-driven quantum phase transition in Weyl semimetals.
Place, publisher, year, edition, pages
Nature Publishing Group, 2016. Vol. 6, 32446
behavior, dielectric constant, experimental model, phase transition
IdentifiersURN: urn:nbn:se:kth:diva-194922DOI: 10.1038/srep32446ScopusID: 2-s2.0-84984827904OAI: oai:DiVA.org:kth-194922DiVA: diva2:1050801
QC 201611302016-11-302016-11-012016-11-30Bibliographically approved