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  Nematicity Arising from a Chiral Superconducting Ground State in Magic-Angle Twisted Bilayer Graphene under In-Plane Magnetic Fields

Yu, T., Kennes, D. M., Rubio, A., & Sentef, M. A. (2021). Nematicity Arising from a Chiral Superconducting Ground State in Magic-Angle Twisted Bilayer Graphene under In-Plane Magnetic Fields. Physical Review Letters, 127(12): 127001. doi:10.1103/PhysRevLett.127.127001.

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PhysRevLett.127.127001.pdf (Publisher version), 474KB
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PhysRevLett.127.127001.pdf
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Open Access. - Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
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Supplemental_Material.pdf (Supplementary material), 441KB
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Supplemental Material: The Supplemental Material contains the detailed symmetry analysis and derivation of effective GL Lagrangian for the superconducting order parameters and estimation of GL parameters by microscopic model.
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https://arxiv.org/abs/2101.01426 (Preprint)
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Yu, T.1, Author              
Kennes, D. M.2, 3, Author              
Rubio, A.3, 4, 5, Author              
Sentef, M. A.1, Author              
Affiliations:
1Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
2Institut für Theorie der Statistischen Physik, 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              
4Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              
5Nano-Bio Spectroscopy Group, Departamento de Física de Materiales, Universidad del País Vasco, ou_persistent22              

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 Abstract: Recent measurements of the resistivity in magic-angle twisted bilayer graphene near the superconducting transition temperature show twofold anisotropy, or nematicity, when changing the direction of an in-plane magnetic field [Cao et al., Science 372, 264 (2021)]. This was interpreted as strong evidence for exotic nematic superconductivity instead of the widely proposed chiral superconductivity. Counterintuitively, we demonstrate that in two-dimensional chiral superconductors the in-plane magnetic field can hybridize the two chiral superconducting order parameters to induce a phase that shows nematicity in the transport response. Its paraconductivity is modulated as cos(2θB), with θB being the direction of the in-plane magnetic field, consistent with experiment in twisted bilayer graphene. We therefore suggest that the nematic response reported by Cao et al. does not rule out a chiral superconducting ground state.

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Language(s): eng - English
 Dates: 2021-01-062021-09-162021-09-132021-09-17
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: arXiv: 2101.01426
DOI: 10.1103/PhysRevLett.127.127001
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 127 (12) Sequence Number: 127001 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1