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  Spin and charge fluctuation induced pairing in ABCB tetralayer graphene

Fischer, A., Klebl, L., Hauck, J. B., Rothstein, A., Waldecker, L., Beschoten, B., et al. (2024). Spin and charge fluctuation induced pairing in ABCB tetralayer graphene. Physical Review Research, 6(1): L012003. doi:10.1103/PhysRevResearch.6.L012003.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000D-331B-C Version Permalink: https://hdl.handle.net/21.11116/0000-000E-2936-8
Genre: Journal Article

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PhysRevResearch.6.L012003.pdf (Publisher version), 3MB
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Supplemental Material: contains details on the non-interacting Hamiltonian, random phase approximation for magnetic and superconducting order for different parameter choices, and explanations of the xRPA, dRPA, and xdRPA mechanisms.
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 Creators:
Fischer, A.1, Author
Klebl, L.2, Author
Hauck, J. B.1, Author
Rothstein, A.3, 4, Author
Waldecker, L.3, Author
Beschoten, B.3, Author
Wehling, T. O.2, 5, Author
Kennes, D. M.1, 6, 7, Author           
Affiliations:
1Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, ou_persistent22              
2I. Institute for Theoretical Physics, Universität Hamburg, ou_persistent22              
32nd Institute of Physics and JARA-FIT, RWTH Aachen University, ou_persistent22              
4Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, ou_persistent22              
5The Hamburg Centre for Ultrafast Imaging, ou_persistent22              
6Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
7Center for Free-Electron Laser Science, ou_persistent22              

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 Abstract: Motivated by the recent experimental realization of ABCB stacked tetralayer graphene [Wirth et al., ACS Nano 16, 16617 (2022)], we study correlated phenomena in moiré-less graphene tetralayers for realistic interaction profiles using an orbital resolved random phase approximation approach. We demonstrate that magnetic fluctuations originating from local interactions are crucial close to the van Hove singularities on the electron- and hole-doped side promoting layer selective ferrimagnetic states. Spin fluctuations around these magnetic states enhance unconventional spin-triplet, valley-singlet superconductivity with f-wave symmetry due to intervalley scattering. Charge fluctuations arising from long range Coulomb interactions promote doubly degenerate p-wave superconductivity close to the van Hove singularities. At the conduction band edge of ABCB graphene, we find that both spin and charge fluctuations drive f-wave superconductivity. Our analysis suggests a strong competition between superconducting states emerging from long- and short-ranged Coulomb interactions and thus stresses the importance of microscopically derived interaction profiles to make reliable predictions for the origin of superconductivity in graphene-based heterostructures.

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Language(s): eng - English
 Dates: 2023-08-182023-06-062023-10-252024-01-08
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2305.14438
DOI: 10.1103/PhysRevResearch.6.L012003
 Degree: -

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Project name : We thank C. Stampfer, T. Taubner, and K. Wirth for fruitful discussions. This work was supported by the Excellence Initiative of the German federal and state governments, the Ministry of Innovation of North Rhine-Westphalia and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation). J.B.H., L.K., A.F., and D.M.K. acknowledge funding by the DFG under RTG 1995, within the Priority Program SPP 2244 “2DMP,” Grant No. 443273985. L.K. and T.O.W. gratefully acknowledge support from the DFG through FOR 5249 (QUAST, Project No. 449872909) and SPP 2244 (Project No. 422707584). T.O.W. is supported by the Cluster of Excellence “CUI: Advanced Imaging of Matter” of the DFG (EXC 2056, Project No. 390715994). D.M.K. acknowledges support by the Max Planck-New York City Center for Nonequilibrium Quantum Phenomena. We acknowledge computational resources provided by the Max Planck Computing and Data Facility, RWTH Aachen University under Projects No. rwth0742 and No. rwth0716, and through the JARA Vergabegremium on the JARA Partition part of the supercomputer JURECA [65] at Forschungszentrum Jülich.
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Title: Physical Review Research
  Abbreviation : Phys. Rev. Research
Source Genre: Journal
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Publ. Info: College Park, Maryland, United States : American Physical Society (APS)
Pages: - Volume / Issue: 6 (1) Sequence Number: L012003 Start / End Page: - Identifier: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564