Instability of j=3/2 Bogoliubov Fermi surfaces

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dc.contributor.authorOh, Hanbitko
dc.contributor.authorMoon, Eun-Gookko
dc.date.accessioned2020-08-06T06:55:05Z-
dc.date.available2020-08-06T06:55:05Z-
dc.date.created2020-07-27-
dc.date.created2020-07-27-
dc.date.created2020-07-27-
dc.date.issued2020-07-
dc.identifier.citationPHYSICAL REVIEW B, v.102, no.2-
dc.identifier.issn2469-9950-
dc.identifier.urihttp://hdl.handle.net/10203/275735-
dc.description.abstractExotic quantum phases including topological states and non-Fermi liquids may be realized by quantum states with total angular momentum j = 3/2, as manifested in HgTe and pyrochlore iridates. Recently, an exotic superconducting state with a nonzero density of states of zero-energy Bogoliubov (BG) quasiparticles, the Bogoliubov Fermi surface (BG-FS), was also proposed in a centrosymmetric j = 3/2 system, protected by a Z(2) topological invariant. Here, we consider interaction effects of a centrosymmetric BG-FS and demonstrate its instability by using mean-field and renormalization group analysis. The Bardeen-Cooper-Schrieffer (BCS)-type logarithmical enhancement is shown in fluctuation channels associated with inversion symmetry. Thus, we claim that the inversion-symmetry instability is an intrinsic characteristic of a BG-FS under generic attractive interactions between BG quasiparticles. In drastic contrast to the standard BCS superconductivity, a Fermi surface may generically survive even with the instability. We propose the experimental setup, a second-harmonic-generation experiment with a strain gradient, to detect the instability. Possible applications to iron-based superconductors and heavy-fermion systems, including FeSe, are also discussed.-
dc.languageEnglish-
dc.publisherAMER PHYSICAL SOC-
dc.titleInstability of j=3/2 Bogoliubov Fermi surfaces-
dc.typeArticle-
dc.identifier.wosid000545539000004-
dc.identifier.scopusid2-s2.0-85088814818-
dc.type.rimsART-
dc.citation.volume102-
dc.citation.issue2-
dc.citation.publicationnamePHYSICAL REVIEW B-
dc.identifier.doi10.1103/PhysRevB.102.020501-
dc.contributor.localauthorMoon, Eun-Gook-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordPlusRESONANCE-
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