Unconventional superconductivity with preformed pairs in twisted bilayer graphene

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

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
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Abstract

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.

Original languageEnglish
Article numberL060503
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B
Volume107
Issue number6
DOIs
Publication statusPublished - 1 Feb 2023
MoE publication typeA1 Journal article-refereed

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