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  Spin-fluctuation-induced pairing in twisted bilayer graphene

Fischer, A., Klebl, L., Honerkamp, C., & Kennes, D. M. (2021). Spin-fluctuation-induced pairing in twisted bilayer graphene. Physical Review B, 103(4): L041103. doi:10.1103/PhysRevB.103.L041103.

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https://arxiv.org/abs/2008.12532 (Preprint)
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 Creators:
Fischer, A.1, Author
Klebl, L.2, Author
Honerkamp, C.1, Author
Kennes, D. M.2, 3, Author              
Affiliations:
1Institute for Theoretical Solid State Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, ou_persistent22              
2Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              

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 Abstract: We investigate the interplay of magnetic fluctuations and Cooper pairing in twisted bilayer graphene from a purely microscopic model within a large-scale tight-binding approach resolving the angstrom scale. For local on-site repulsive interactions and using the random-phase approximation for spin fluctuations, we derive a microscopic effective pairing interaction that we use for self-consistent solutions of the Bogoliubov–de Gennes equations of superconductivity. We study the predominant pairing types as a function of interaction strength, temperature, and band filling. For large regions of this parameter space, we find chiral d-wave pairing regimes, spontaneously breaking time-reversal symmetry, separated by magnetic instabilities at integer band fillings. Interestingly, the d-wave pairing is strongly concentrated in the AA regions of the moiré unit cell and exhibits phase windings of integer multiples of 2π around these superconducting islands, i.e., pinned vortices. The spontaneous circulating current creates a distinctive magnetic field pattern. This signature of the chiral pairing should be measurable by state-of-the-art experimental techniques.

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Language(s): eng - English
 Dates: 2020-12-122020-08-282020-12-152021-01-072021-01-15
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.103.L041103
arXiv: 2008.12532
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 103 (4) Sequence Number: L041103 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008