dc.contributor.author | Kerelsky, Alexander | |
dc.contributor.author | Rubio Verdú, Carmen | |
dc.contributor.author | Xian, Lede | |
dc.contributor.author | Kennes, Dante M. | |
dc.contributor.author | Halbertal, Dorri | |
dc.contributor.author | Finney, Nathan | |
dc.contributor.author | Song, Larry | |
dc.contributor.author | Turkel, Simon | |
dc.contributor.author | Wang, Lei | |
dc.contributor.author | Watanabe, Kenji | |
dc.contributor.author | Taniguchi, Takashi | |
dc.contributor.author | Hone, James | |
dc.contributor.author | Dean, Cory R. | |
dc.contributor.author | Basov, Dmitri N. | |
dc.contributor.author | Rubio Secades, Angel | |
dc.contributor.author | Pasupathy, Abhay N. | |
dc.date.accessioned | 2021-03-15T09:00:25Z | |
dc.date.available | 2021-03-15T09:00:25Z | |
dc.date.issued | 2021-01-26 | |
dc.identifier.citation | Proceedings of the National Academy of Sciences of the United States of America 118(4) : (2021) // Article ID e2017366118 | es_ES |
dc.identifier.issn | 0027-8424 | |
dc.identifier.uri | http://hdl.handle.net/10810/50626 | |
dc.description.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 moire 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 | es_ES |
dc.description.sponsorship | This work was supported by Programmable Quantum Materials, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences, under Award DE-SC0019443. STM equipment support was provided by the Air Force Office of Scientific Research via Grant FA9550-16-1-0601 and by the Office of Naval Research via Grant N00014-17-1-2967. C.R.-V. acknowledges funding from the European Union's Horizon 2020 research and innovation program under Marie Sklodowska Curie Grant Agreement 844271. L.X. and A.R. acknowledge funding from the European Research Council (ERC-2015-AdG694097), Cluster of Excellence Advanced Imaging of Matter EXC 2056 -390715994 and RTG 2247 by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), SFB925 and Grupos Consolidados (IT1249-19). The Flatiron Institute is a division of the Simons Foundation. We acknowledge support from the Max Planck-New York City Center for Non-Equilibrium Quantum Phenomena. D.M.K. acknowledges funding from the DFG under Germany's Excellence Strategy - Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC 2004/1 -390534769 and within the Priority Program SPP 2244 "2DMP." D.N.B. is Moore Investigator in Quantum Materials EPIQS #94553. D.H. was supported by a grant from the Simons Foundation (579913) | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | National Academy of Sciences | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/844271 | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/694097 | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ | * |
dc.subject | scanning tunneling microscopy | es_ES |
dc.subject | scanning tunneling spectroscopy | es_ES |
dc.subject | graphene | es_ES |
dc.subject | electron correlations | es_ES |
dc.subject | topology | es_ES |
dc.subject | magic-angle | es_ES |
dc.subject | transport | es_ES |
dc.subject | insulator | es_ES |
dc.subject | MOTT | es_ES |
dc.title | Moireless Correlations in ABCA Graphene | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.holder | This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) | es_ES |
dc.rights.holder | Atribución-NoComercial-SinDerivadas 3.0 España | * |
dc.relation.publisherversion | https://www.pnas.org/content/118/4/e2017366118.long | es_ES |
dc.identifier.doi | 10.1073/pnas.2017366118 | |
dc.contributor.funder | European Commission | |
dc.departamentoes | Polímeros y Materiales Avanzados: Física, Química y Tecnología | es_ES |
dc.departamentoeu | Polimero eta Material Aurreratuak: Fisika, Kimika eta Teknologia | es_ES |