Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene

Understanding electron-phonon interactions is fundamentally important and has crucial implications for device applications. However, in twisted bilayer graphene near the magic angle, this understanding is currently lacking. Here, we study electron-phonon coupling using time- and frequency-resolved p...

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Autores: Dudley Mehew, Jake, Luque Merino, Rafael, Ishizuka, Hiroaki, Block, Alexander, Díez Mérida, Jaime, Díez Carlón, Andrés, Watanabe, Kenji, Taniguchi, Takashi, Levitov, Leonid S., Efetov, Dmitri K., Tielrooij, Klaas-Jan
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/356807
Acceso en línea:http://hdl.handle.net/10261/356807
Access Level:acceso abierto
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repository_id_str
dc.title.none.fl_str_mv Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene
title Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene
spellingShingle Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene
Dudley Mehew, Jake
title_short Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene
title_full Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene
title_fullStr Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene
title_full_unstemmed Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene
title_sort Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene
dc.creator.none.fl_str_mv Dudley Mehew, Jake
Luque Merino, Rafael
Ishizuka, Hiroaki
Block, Alexander
Díez Mérida, Jaime
Díez Carlón, Andrés
Watanabe, Kenji
Taniguchi, Takashi
Levitov, Leonid S.
Efetov, Dmitri K.
Tielrooij, Klaas-Jan
author Dudley Mehew, Jake
author_facet Dudley Mehew, Jake
Luque Merino, Rafael
Ishizuka, Hiroaki
Block, Alexander
Díez Mérida, Jaime
Díez Carlón, Andrés
Watanabe, Kenji
Taniguchi, Takashi
Levitov, Leonid S.
Efetov, Dmitri K.
Tielrooij, Klaas-Jan
author_role author
author2 Luque Merino, Rafael
Ishizuka, Hiroaki
Block, Alexander
Díez Mérida, Jaime
Díez Carlón, Andrés
Watanabe, Kenji
Taniguchi, Takashi
Levitov, Leonid S.
Efetov, Dmitri K.
Tielrooij, Klaas-Jan
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Generalitat de Catalunya
Ministerio de Ciencia e Innovación (España)
Agencia Estatal de Investigación (España)
European Commission
Japan Society for the Promotion of Science
Fundación la Caixa
European Research Council
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description Understanding electron-phonon interactions is fundamentally important and has crucial implications for device applications. However, in twisted bilayer graphene near the magic angle, this understanding is currently lacking. Here, we study electron-phonon coupling using time- and frequency-resolved photovoltage measurements as direct and complementary probes of phonon-mediated hot-electron cooling. We find a remarkable speedup in cooling of twisted bilayer graphene near the magic angle: The cooling time is a few picoseconds from room temperature down to 5 kelvin, whereas in pristine bilayer graphene, cooling to phonons becomes much slower for lower temperatures. Our experimental and theoretical analysis indicates that this ultrafast cooling is a combined effect of superlattice formation with low-energy moiré phonons, spatially compressed electronic Wannier orbitals, and a reduced superlattice Brillouin zone. This enables efficient electron-phonon Umklapp scattering that overcomes electron-phonon momentum mismatch. These results establish twist angle as an effective way to control energy relaxation and electronic heat flow.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
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info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/356807
url http://hdl.handle.net/10261/356807
dc.language.none.fl_str_mv Inglés
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info:eu-repo/grantAgreement/AEI//SEV-2017-0706
info:eu-repo/grantAgreement/EC/H2020/804349
info:eu-repo/grantAgreement/AEI//RYC-2017-22330
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-111673GB-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PCI2021-122101-2A
Dudley Mehew, Jake; Luque Merino, Rafael; Ishizuka, Hiroaki; Block, Alexander; Díez Mérida, Jaime; Díez Carlón, Andrés; Watanabe, Kenji; Taniguchi, Takashi; Levitov, Leonid S.; Efetov, Dmitri K.; Tielrooij, Klaas-Jan; 2024; Supplementary Materials for Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene [Dataset]; American Association for the Advancement of Science; https://doi.org/10.1126/sciadv.adj1361
https://doi.org/10.1126/sciadv.adj1361
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Association for the Advancement of Science
publisher.none.fl_str_mv American Association for the Advancement of Science
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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spelling Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer grapheneDudley Mehew, JakeLuque Merino, RafaelIshizuka, HiroakiBlock, AlexanderDíez Mérida, JaimeDíez Carlón, AndrésWatanabe, KenjiTaniguchi, TakashiLevitov, Leonid S.Efetov, Dmitri K.Tielrooij, Klaas-JanUnderstanding electron-phonon interactions is fundamentally important and has crucial implications for device applications. However, in twisted bilayer graphene near the magic angle, this understanding is currently lacking. Here, we study electron-phonon coupling using time- and frequency-resolved photovoltage measurements as direct and complementary probes of phonon-mediated hot-electron cooling. We find a remarkable speedup in cooling of twisted bilayer graphene near the magic angle: The cooling time is a few picoseconds from room temperature down to 5 kelvin, whereas in pristine bilayer graphene, cooling to phonons becomes much slower for lower temperatures. Our experimental and theoretical analysis indicates that this ultrafast cooling is a combined effect of superlattice formation with low-energy moiré phonons, spatially compressed electronic Wannier orbitals, and a reduced superlattice Brillouin zone. This enables efficient electron-phonon Umklapp scattering that overcomes electron-phonon momentum mismatch. These results establish twist angle as an effective way to control energy relaxation and electronic heat flow.ICN2 was supported by the Severo Ochoa program from Spanish MINECO grant no. SEV-2017-0706. R.L.M. acknowledges that this project has received funding from the “Secretaria d’Universitats I Recerca de la Generalitat de Catalunya, as well as the European Social Fund (L’FSE inverteix en el teu futur)–FEDER. H.I. acknowledges support from JSPS KAKENHI (grant number JP19K14649). J.D.Mé. acknowledges support from the INphINIT “la Caixa” Foundation (ID 100010434) fellowship programme (LCF/BQ/DI19/11730021). K.W. and T.T. acknowledge support from the JSPS KAKENHI (grant numbers 19H05790, 20H00354, and 21H05233). K.-J.T. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under grant agreement no. 804349 (ERC StG CUHL), RYC fellowship no. RYC-2017-22330, IAE project PID2019-111673GB-I00 and the FLAG-ERA grant ENPHOCAL, by MICIN with No. PCI2021-122101-2A (Spain).Peer reviewedAmerican Association for the Advancement of ScienceMinisterio de Ciencia, Innovación y Universidades (España)Generalitat de CatalunyaMinisterio de Ciencia e Innovación (España)Agencia Estatal de Investigación (España)European CommissionJapan Society for the Promotion of ScienceFundación la CaixaEuropean Research CouncilConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202420242024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/356807reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI//SEV-2017-0706info:eu-repo/grantAgreement/EC/H2020/804349info:eu-repo/grantAgreement/AEI//RYC-2017-22330info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-111673GB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PCI2021-122101-2ADudley Mehew, Jake; Luque Merino, Rafael; Ishizuka, Hiroaki; Block, Alexander; Díez Mérida, Jaime; Díez Carlón, Andrés; Watanabe, Kenji; Taniguchi, Takashi; Levitov, Leonid S.; Efetov, Dmitri K.; Tielrooij, Klaas-Jan; 2024; Supplementary Materials for Ultrafast Umklapp-assisted electron-phonon cooling in magic-angle twisted bilayer graphene [Dataset]; American Association for the Advancement of Science; https://doi.org/10.1126/sciadv.adj1361https://doi.org/10.1126/sciadv.adj1361Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3568072026-05-22T06:33:51Z
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