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  Unconventional superconductivity in magic-angle twisted trilayer graphene

Fischer, A., Goodwin, Z. A. H., Mostofi, A. A., Lischner, J., Kennes, D. M., & Klebl, L. (2022). Unconventional superconductivity in magic-angle twisted trilayer graphene. npj Quantum Materials, 7(1): 5. doi:10.1038/s41535-021-00410-w.

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Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
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https://arxiv.org/abs/2104.10176 (Preprint)
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https://doi.org/10.1038/s41535-021-00410-w (Publisher version)
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 Creators:
Fischer, A.1, Author
Goodwin, Z. A. H.2, Author
Mostofi, A. A.2, Author
Lischner, J.2, Author
Kennes, D. M.1, 3, 4, Author              
Klebl, L.1, Author
Affiliations:
1Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, ou_persistent22              
2Departments of Materials and Physics and the Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Free Electron Laser Science, ou_persistent22              

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 Abstract: Magic-angle twisted trilayer graphene (MATTG) recently emerged as a highly tunable platform for studying correlated phases of matter, such as correlated insulators and superconductivity. Superconductivity occurs in a range of doping levels that is bounded by van Hove singularities, which stimulates the debate of the origin and nature of superconductivity in this material. In this work, we discuss the role of spin-fluctuations arising from atomic-scale correlations in MATTG for the superconducting state. We show that in a phase diagram as a function of doping (ν) and temperature, nematic superconducting regions are surrounded by ferromagnetic states and that a superconducting dome with Tc ≈ 2 K appears between the integer fillings ν = −2 and ν = −3. Applying a perpendicular electric field enhances superconductivity on the electron-doped side which we relate to changes in the spin-fluctuation spectrum. We show that the nematic unconventional superconductivity leads to pronounced signatures in the local density of states detectable by scanning tunneling spectroscopy measurements.

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Language(s): eng - English
 Dates: 2021-05-202021-12-012022-01-13
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: arXiv: 2104.10176
DOI: 10.1038/s41535-021-00410-w
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Title: npj Quantum Materials
  Other : npj Quantum Mater.
Source Genre: Journal
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Publ. Info: [London] : Nature Publishing Group
Pages: - Volume / Issue: 7 (1) Sequence Number: 5 Start / End Page: - Identifier: ISSN: 2397-4648
CoNE: https://pure.mpg.de/cone/journals/resource/2397-4648