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  Moiréless correlations in ABCA graphene

Kerelsky, A., Rubio-Verdú, C., Xian, L. D., Kennes, D. M., Halbertal, D., Finney, N., et al. (2021). Moiréless correlations in ABCA graphene. Proceedings of the National Academy of Sciences of the United States of America, 118(4): e2017366118. doi:10.1073/pnas.2017366118.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-43C1-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-B9D8-5
Genre: Journal Article

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https://arxiv.org/abs/1911.00007 (Preprint)
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https://dx.doi.org/10.1073/pnas.2017366118 (Publisher version)
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 Creators:
Kerelsky, A.1, Author
Rubio-Verdú, C.1, Author
Xian, L. D.2, 3, Author              
Kennes, D. M.2, 4, 5, Author              
Halbertal, D.1, Author
Finney, N.6, Author
Song, L.1, Author
Turkel, S.1, Author
Wang, L.1, Author
Watanabe, K.7, Author
Taniguchi, T.7, Author
Hone, J.6, Author
Dean, C.1, Author
Basov, D.1, Author
Rubio, A.2, 8, 9, Author              
Pasupathy, A. N.1, Author
Affiliations:
1Department of Physics, Columbia University, New York, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Frontier Research Center, Songshan Lake Materials Laboratory, ou_persistent22              
4Institut für Theorie der Statistischen Physik, RWTH Aachen University, 2056 Aachen, Germany and JARA-Fundamentals of Future Information Technology, ou_persistent22              
5Jülich Aachen Research Alliance-Fundamentals of Future Information Technology, ou_persistent22              
6Department of Mechanical Engineering, Columbia University, New York, ou_persistent22              
7National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, ou_persistent22              
8Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              
9Nano-Bio Spectroscopy Group, Departamento de Fisica de Materiales, Universidad del Pas Vasco, ou_persistent22              

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Free keywords: scanning tunneling microscopy; scanning tunneling spectroscopy; graphene; electron correlations; topology
 Abstract: Atomically thin van der Waals materials stacked with an interlayer twist have proven to be an excellent platform toward achieving gate-tunable correlated phenomena linked to the formation of flat electronic bands. In this work we demonstrate the formation of emergent correlated phases in multilayer rhombohedral graphene––a simple material that also exhibits a flat electronic band edge but without the need of having a moiré superlattice induced by twisted van der Waals layers. We show that two layers of bilayer graphene that are twisted by an arbitrary tiny angle host large (micrometer-scale) regions of uniform rhombohedral four-layer (ABCA) graphene that can be independently studied. Scanning tunneling spectroscopy reveals that ABCA graphene hosts an unprecedentedly sharp van Hove singularity of 3–5-meV half-width. We demonstrate that when this van Hove singularity straddles the Fermi level, a correlated many-body gap emerges with peak-to-peak value of 9.5 meV at charge neutrality. Mean-field theoretical calculations for model with short-ranged interactions indicate that two primary candidates for the appearance of this broken symmetry state are a charge-transfer excitonic insulator and a ferrimagnet. Finally, we show that ABCA graphene hosts surface topological helical edge states at natural interfaces with ABAB graphene which can be turned on and off with gate voltage, implying that small-angle twisted double-bilayer graphene is an ideal programmable topological quantum material.

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Language(s): eng - English
 Dates: 2020-12-162021-01-192021-01-26
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 1911.00007
DOI: 10.1073/pnas.2017366118
 Degree: -

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Project name : -
Grant ID : 844271
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : PNAS
  Other : Proceedings of the National Academy of Sciences of the USA
  Abbreviation : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 118 (4) Sequence Number: e2017366118 Start / End Page: - Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230