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From Birefringent Electrons to a Marginal or Non-Fermi Liquid of Relativistic Spin- 1/2 Fermions: An Emergent Superuniversality
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2018 (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
American Physical Society , 2018. Vol. 121, no 15, article id 157602
Keywords [en]
Birefringence, Degrees of freedom (mechanics), Fermi liquids, Fermions, Half-odd integers, Long-range Coulomb interaction, Marginal fermi liquids, Non-Fermi liquids, Quasirelativistic, Spin-1/2 fermions, Spontaneous symmetry breaking, Three dimensions, Liquids
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-247137DOI: 10.1103/PhysRevLett.121.157602ISI: 000447192000016Scopus ID: 2-s2.0-85054821455OAI: oai:DiVA.org:kth-247137DiVA, id: diva2:1301868
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-03Bibliographically approved

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Juricic, Vladimir

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