Superconductivity Induced by Flexural Modes in Non-σ_h-Symmetric Dirac-Like Two-Dimensional Materials: A Theoretical Study for Silicene and Germanene

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dc.contributor.ORCID0000-0001-5926-0200 (Fischetti, MV)
dc.contributor.authorFischetti, Massimo V.
dc.contributor.authorPolley, Arup
dc.contributor.utdAuthorFischetti, Massimo V.
dc.date.accessioned2019-05-31T18:41:16Z
dc.date.available2019-05-31T18:41:16Z
dc.date.created2018-04-12
dc.description.abstractIn two-dimensional crystals that lack symmetry under reflections on the horizontal plane of the lattice (non-σ_h-symmetric), electrons can couple to flexural modes (ZA phonons) at first order. We show that in materials of this type that also exhibit a Dirac-like electron dispersion, the strong coupling can result in electron pairing mediated by these phonons, as long as the flexural modes are not damped or suppressed by additional interactions with a supporting substrate or gate insulator. We consider several models: The weak-coupling limit, which is applicable only in the case of gapped and parabolic materials, like stanene and HfSe₂, thanks to the weak coupling; the full gap-equation, solved using the constant-gap approximation and considering statically screened interactions; its extensions to energy-dependent gap and to dynamic screening. We argue that in the case of silicene and germanene superconductivity mediated by this process can exhibit a critical temperature of a few degrees K, or even a few tens of degrees K when accounting for the effect of a high-dielectric- constant environment. We conclude that the electron/flexural-modes coupling should be included in studies of possible superconductivity in non-σ_h-symmetric two-dimensional crystals, even if alternative forms of coupling are considered.
dc.description.departmentErik Jonsson School of Engineering and Computer Science
dc.identifier.bibliographicCitationFischetti, Massimo V., and Arup Polley. 2018. "Superconductivity induced by flexural modes in non-σ_h-symmetric Dirac-like two-dimensional materials: A theoretical study for silicene and germanene." Physical Review B 97(14), 10.1103/PhysRevB.97.144509
dc.identifier.issn2469-9950
dc.identifier.issue14
dc.identifier.urihttps://hdl.handle.net/10735.1/6510
dc.identifier.volume97
dc.language.isoen
dc.publisherAmer Physical Soc
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevB.97.144509
dc.rights©2018 American Physical Society
dc.source.journalPhysical Review B
dc.subjectElectron-phonon interactions
dc.subjectSuperconductivity
dc.subjectTemperature
dc.subjectCrystals
dc.titleSuperconductivity Induced by Flexural Modes in Non-σ_h-Symmetric Dirac-Like Two-Dimensional Materials: A Theoretical Study for Silicene and Germanene
dc.type.genrearticle

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