Cristin-resultat-ID: 1814663
Sist endret: 1. mars 2021 13:10
NVI-rapporteringsår: 2020
Resultat
Vitenskapelig artikkel
2020

Phonon-mediated superconductivity in doped monolayer materials

Bidragsytere:
  • Even Thingstad
  • Akashdeep Kamra
  • Justin Wells og
  • Asle Sudbø

Tidsskrift

Physical review B (PRB)
ISSN 2469-9950
e-ISSN 2469-9969
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2020
Publisert online: 2020
Trykket: 2020
Volum: 101
Hefte: 21
Artikkelnummer: 214513
Open Access

Klassifisering

Vitenskapsdisipliner

Kondenserte fasers fysikk

Emneord

Lavdimensjonale systemer • Superledning

Beskrivelse Beskrivelse

Tittel

Phonon-mediated superconductivity in doped monolayer materials

Sammendrag

Insight into why superconductivity in pristine and doped monolayer graphene seems strongly suppressed has been central for the recent years' various creative approaches to realize superconductivity in graphene and graphene-like systems. We provide further insight by studying electron-phonon coupling and superconductivity in doped monolayer graphene and hexagonal boron nitride based on intrinsic phonon modes. Solving the graphene gap equation using a detailed model for the effective attraction based on electron tight binding and phonon force constant models, the various system parameters can be tuned at will. Consistent with results in the literature, we find slight gap modulations along the Fermi surface, and the high-energy phonon modes are shown to be the most significant for the superconductivity instability. The Coulomb interaction plays a major role in suppressing superconductivity at realistic dopings. Motivated by the direct onset of a large density of states at the Fermi surface for small charge dopings in hexagonal boron nitride, we also calculate the dimensionless electron-phonon coupling strength there, but the comparatively large density of states cannot immediately be capitalized on, and the charge doping necessary to obtain significant electron-phonon coupling is similar to the value in graphene.

Bidragsytere

Even Thingstad

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk ved Norges teknisk-naturvitenskapelige universitet

Akashdeep Kamra

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk ved Norges teknisk-naturvitenskapelige universitet

Justin Wells

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk ved Norges teknisk-naturvitenskapelige universitet

Asle Sudbø

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk ved Norges teknisk-naturvitenskapelige universitet
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