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  Observation of competing, correlated ground states in the flat band of rhombohedral graphite

Hagymasi, I., Isa, M. S. M., Tajkov, Z., Marity, K., Oroszlany, L., Koltai, J., et al. (2022). Observation of competing, correlated ground states in the flat band of rhombohedral graphite. Science Advances, 8(35). doi:10.1126/sciadv.abo6879.

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Hagymasi, Imre1, Author           
Isa, Mohammad Syahid Mohd2, Author
Tajkov, Zoltan2, Author
Marity, Krisztian2, Author
Oroszlany, Laszlo2, Author
Koltai, Janos2, Author
Alassaf, Assem2, Author
Kun, Peter2, Author
Kandrai, Konrad2, Author
Palinkas, Andras2, Author
Vancso, Peter2, Author
Tapaszto, Levente2, Author
Nemes-Incze, Peter2, Author
Affiliations:
1Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              
2external, ou_persistent22              

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 Abstract: In crystalline solids, the interactions of charge and spin can result in a variety of emergent quantum ground states, especially in partially filled, topological flat bands such as Landau levels or in "magic angle" graphene layers. Much less explored is rhombohedral graphite (RG), perhaps the simplest and structurally most perfect condensed matter system to host a flat band protected by symmetry. By scanning tunneling microscopy, we map the flat band charge density of 8, 10, 14, and 17 layers and identify a domain structure emerging from a competition between a sublattice antiferromagnetic insulator and a gapless correlated paramagnet. Our density matrix renormalization group calculations explain the observed features and demonstrate that the correlations are fundamentally different from graphene-based magnetism identified until now, forming the ground state of a quantum magnet. Our work establishes RG as a platform to study many-body interactions beyond the mean-field approach, where quantum fluctuations and entanglement dominate.

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Language(s): eng - English
 Dates: 2022-09-022022-09-02
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000888759400007
DOI: 10.1126/sciadv.abo6879
arXiv: 2201.10844
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 8 (35) Sequence Number: - Start / End Page: - Identifier: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548