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From Birefringent Electrons to a Marginal or Non-Fermi Liquid of Relativistic Spin-1/2 Fermions: An Emergent Superuniversality
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0002-3000-5393
Number of Authors: 42018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 15, article id 157602Article in journal (Refereed) Published
Abstract [en]

We present the quantum critical theory of an interacting nodal Fermi liquid of quasirelativistic pseudospin-3/2 fermions that have a noninteracting birefringent spectrum with two distinct Fermi velocities. When such quasiparticles interact with gapless bosonic degrees of freedom that mediate either the long-range Coulomb interaction or its short range component (responsible for spontaneous symmetry breaking), in the deep infrared or quantum critical regime in two dimensions, the system is, respectively, described by a marginal- or a non-Fermi liquid of relativistic spin-1/2 fermions (possessing a unique velocity), and is always a marginal Fermi liquid in three dimensions. We consider a possible generalization of these scenarios to fermions with an arbitrary half-odd-integer spin, and conjecture that critical spin-1/2 excitations represent a superuniversal description of the entire family of interacting quasirelativistic fermions.

Place, publisher, year, edition, pages
2018. Vol. 121, no 15, article id 157602
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-161957DOI: 10.1103/PhysRevLett.121.157602ISI: 000447192000016PubMedID: 30362789OAI: oai:DiVA.org:su-161957DiVA, id: diva2:1262612
Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2019-12-09Bibliographically approved

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