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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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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0008-FCD6-B Versions-Permalink: https://hdl.handle.net/21.11116/0000-000B-F4DB-B
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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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 Urheber:
Fischer, A.1, Autor
Goodwin, Z. A. H.2, Autor
Mostofi, A. A.2, Autor
Lischner, J.2, Autor
Kennes, D. M.1, 3, 4, Autor           
Klebl, L.1, Autor
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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 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2021-05-202021-12-012022-01-13
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: arXiv: 2104.10176
DOI: 10.1038/s41535-021-00410-w
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Projektname : We thank V. Vitale for useful discussions on DFT simulations and X. Liang for useful discussions on the relaxations of the system. Z.A.H.G. was supported through a studentship in the Centre for Doctoral Training on Theory and Simulation of Materials at Imperial College London funded by the EPSRC (EP/L015579/1). We acknowledge funding from EPSRC grant EP/S025324/1, support from the Thomas Young Centre under grant number TYC-101, and the Imperial College London Research Computing Service (https://doi.org/10.14469/hpc/2232) for computational resources used in carrying out this work. The Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) is acknowledged for support through RTG 1995, within the Priority Program SPP 2244 2DMP and under Germany’s Excellence Strategy-Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC2004/1 - 390534769. We acknowledge support from the Max Planck-New York City Center for Non-Equilibrium Quantum Phenomena. RPA, BdG, and LDOS calculations were performed with computing resources granted by RWTH Aachen University under projects rwth0589 and rwth0595.
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Quelle 1

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Titel: npj Quantum Materials
  Andere : npj Quantum Mater.
Genre der Quelle: Zeitschrift
 Urheber:
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Ort, Verlag, Ausgabe: [London] : Nature Publishing Group
Seiten: - Band / Heft: 7 (1) Artikelnummer: 5 Start- / Endseite: - Identifikator: ISSN: 2397-4648
CoNE: https://pure.mpg.de/cone/journals/resource/2397-4648