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 language | English |
|---|---|
| Article number | L060503 |
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Physical Review B |
| Volume | 107 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1 Feb 2023 |
| MoE publication type | A1 Journal article-refereed |
Funding
This work is supported by Academy of Finland Grant No. 308339. A.A.Z. also acknowledges the Center of Excellence in Quantum Technology Finland. The authors acknowledge Jose Lado for useful comments. Acknowledgments. This work is supported by Academy of Finland Grant No. 308339. A.A.Z. also acknowledges the Center of Excellence in Quantum Technology Finland. The authors acknowledge Jose Lado for useful comments.
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Study Results from Aalto University Provide New Insights into Electronics (Unconventional Superconductivity With Preformed Pairs In Twisted Bilayer Graphene)
04/04/2023
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