Moireless Correlations in ABCA Graphene
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...
| Autores: | , , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad del País Vasco |
| Repositorio: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/50626 |
| Acceso en línea: | http://hdl.handle.net/10810/50626 |
| Access Level: | acceso abierto |
| Palabra clave: | scanning tunneling microscopy scanning tunneling spectroscopy graphene electron correlations topology magic-angle transport insulator MOTT |
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Moireless Correlations in ABCA GrapheneKerelsky, AlexanderRubio Verdú, CarmenXian, LedeKennes, Dante M.Halbertal, DorriFinney, NathanSong, LarryTurkel, SimonWang, LeiWatanabe, KenjiTaniguchi, TakashiHone, JamesDean, Cory R.Basov, Dmitri N.Rubio Secades, AngelPasupathy, Abhay N.scanning tunneling microscopyscanning tunneling spectroscopygrapheneelectron correlationstopologymagic-angletransportinsulatorMOTTAtomically 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 materialThis 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)National Academy of SciencesEuropean Commission202120212021info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/50626reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoInglésinfo:eu-repo/grantAgreement/EC/H2020/844271info:eu-repo/grantAgreement/EC/H2020/694097https://www.pnas.org/content/118/4/e2017366118.longinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/3.0/es/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND)Atribución-NoComercial-SinDerivadas 3.0 Españaoai:addi.ehu.eus:10810/506262026-06-18T09:23:17Z |
| dc.title.none.fl_str_mv |
Moireless Correlations in ABCA Graphene |
| title |
Moireless Correlations in ABCA Graphene |
| spellingShingle |
Moireless Correlations in ABCA Graphene Kerelsky, Alexander scanning tunneling microscopy scanning tunneling spectroscopy graphene electron correlations topology magic-angle transport insulator MOTT |
| title_short |
Moireless Correlations in ABCA Graphene |
| title_full |
Moireless Correlations in ABCA Graphene |
| title_fullStr |
Moireless Correlations in ABCA Graphene |
| title_full_unstemmed |
Moireless Correlations in ABCA Graphene |
| title_sort |
Moireless Correlations in ABCA Graphene |
| dc.creator.none.fl_str_mv |
Kerelsky, Alexander Rubio Verdú, Carmen Xian, Lede Kennes, Dante M. Halbertal, Dorri Finney, Nathan Song, Larry Turkel, Simon Wang, Lei Watanabe, Kenji Taniguchi, Takashi Hone, James Dean, Cory R. Basov, Dmitri N. Rubio Secades, Angel Pasupathy, Abhay N. |
| author |
Kerelsky, Alexander |
| author_facet |
Kerelsky, Alexander Rubio Verdú, Carmen Xian, Lede Kennes, Dante M. Halbertal, Dorri Finney, Nathan Song, Larry Turkel, Simon Wang, Lei Watanabe, Kenji Taniguchi, Takashi Hone, James Dean, Cory R. Basov, Dmitri N. Rubio Secades, Angel Pasupathy, Abhay N. |
| author_role |
author |
| author2 |
Rubio Verdú, Carmen Xian, Lede Kennes, Dante M. Halbertal, Dorri Finney, Nathan Song, Larry Turkel, Simon Wang, Lei Watanabe, Kenji Taniguchi, Takashi Hone, James Dean, Cory R. Basov, Dmitri N. Rubio Secades, Angel Pasupathy, Abhay N. |
| author2_role |
author author author author author author author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
European Commission |
| dc.subject.none.fl_str_mv |
scanning tunneling microscopy scanning tunneling spectroscopy graphene electron correlations topology magic-angle transport insulator MOTT |
| topic |
scanning tunneling microscopy scanning tunneling spectroscopy graphene electron correlations topology magic-angle transport insulator MOTT |
| description |
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 |
| publishDate |
2021 |
| dc.date.none.fl_str_mv |
2021 2021 2021 |
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info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10810/50626 |
| url |
http://hdl.handle.net/10810/50626 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
info:eu-repo/grantAgreement/EC/H2020/844271 info:eu-repo/grantAgreement/EC/H2020/694097 https://www.pnas.org/content/118/4/e2017366118.long |
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info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Atribución-NoComercial-SinDerivadas 3.0 España |
| eu_rights_str_mv |
openAccess |
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http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Atribución-NoComercial-SinDerivadas 3.0 España |
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application/pdf |
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National Academy of Sciences |
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National Academy of Sciences |
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reponame:Addi. Archivo Digital para la Docencia y la Investigación instname:Universidad del País Vasco |
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Universidad del País Vasco |
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Addi. Archivo Digital para la Docencia y la Investigación |
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Addi. Archivo Digital para la Docencia y la Investigación |
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