Unconventional superconductivity with preformed pairs in twisted bilayer graphene

Sk Firoz Islam, A. Yu Zyuzin, Alexander A. Zyuzin

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

4 Sitaatiot (Scopus)
83 Lataukset (Pure)

Abstrakti

We present a theory of superconductivity in magic-angle twisted bilayer graphene and analyze the superconducting phase diagram in the presence of the magnetic field. Namely, we consider a model of a granular array hosting localized states, which are hybridized via the delocalized fermions in the intergrain regions. We study a strong-coupling situation when the interactions lead to an incoherent state with preformed Cooper pairs inside the grains. The Andreev scattering among different grains manifests itself through the global phase-coherent superconducting state at lower temperatures. We demonstrate that a new phase transition between the preformed Cooper pairing state and the Larkin-Ovchinnikov-Fulde-Ferrell state might be induced by the spin pair-breaking effect of in-plane magnetic field. The upper critical magnetic field is shown to be enhanced in the strong-coupling case.

AlkuperäiskieliEnglanti
ArtikkeliL060503
Sivut1-6
Sivumäärä6
JulkaisuPhysical Review B
Vuosikerta107
Numero6
DOI - pysyväislinkit
TilaJulkaistu - 1 helmik. 2023
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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