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Interacting Weyl fermions: Phases, phase transitions, and global phase diagram
KTH, Centra, Nordic Institute for Theoretical Physics NORDITA.
2017 (Engelska)Ingår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, nr 20, artikel-id 201102Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We study the effects of short-range interactions on a generalized three-dimensional Weyl semimetal, where the band touching points act as the (anti)monopoles of Abelian Berry curvature of strength n. We show that any local interaction has a negative scaling dimension -2/n. Consequently, all Weyl semimetals are stable against weak short-range interactions. For sufficiently strong interactions, we demonstrate that the Weyl semimetal either undergoes a first-order transition into a band insulator or a continuous transition into a symmetry breaking phase. A translational symmetry breaking axion insulator and a rotational symmetry breaking semimetal are two prominent candidates for the broken symmetry phase. At the one-loop order, the correlation length exponent for continuous transitions is ν=n/2, indicating their non-Gaussian nature for any n>1. We also discuss the scaling of the thermodynamic and transport quantities in general Weyl semimetals as well as inside broken symmetry phases.

Ort, förlag, år, upplaga, sidor
American Physical Society , 2017. Vol. 95, nr 20, artikel-id 201102
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Fysik
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URN: urn:nbn:se:kth:diva-216500DOI: 10.1103/PhysRevB.95.201102ISI: 000400662700001Scopus ID: 2-s2.0-85024372748OAI: oai:DiVA.org:kth-216500DiVA, id: diva2:1162004
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QC 20171201

Tillgänglig från: 2017-12-01 Skapad: 2017-12-01 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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Juričić, Vladimir
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Nordic Institute for Theoretical Physics NORDITA
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Physical Review B
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