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Odd-frequency Berezinskii superconductivity in Dirac semimetals
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Connecticut, USA.ORCID iD: 0000-0003-4984-889X
Number of Authors: 32019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 18, article id 180502Article in journal (Refereed) Published
Abstract [en]

We formulate a general framework for addressing both odd- and even-frequency superconductivity in Dirac semimetals and demonstrate that the odd-frequency or the Berezinskii pairing can naturally appear in these materials because of the chirality degree of freedom. We show that repulsive frequency-dependent interactions favor the Berezinskii pairing while an attractive electron-electron interaction allows for the BCS pairing. In the case of Dirac and Weyl semimetals at the charge neutrality point, both the conventional BCS and odd-frequency Berezinskii pairings require critical coupling. Since these pairings could originate from physically different mechanisms, our findings pave the way for controlling the realization of the Berezinskii superconductivity in topological semimetals. We also present the density of states with several cusplike features that can serve as an experimentally verifiable signature of the odd-frequency gap.

Place, publisher, year, edition, pages
2019. Vol. 100, no 18, article id 180502
National Category
Materials Engineering Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-176528DOI: 10.1103/PhysRevB.100.180502ISI: 000495949800002OAI: oai:DiVA.org:su-176528DiVA, id: diva2:1380502
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19Bibliographically approved

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Sukhachov, P. O.Juričić, VladimirBalatsky, Alexander
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