Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film

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dc.citation.articleNumber9376en_US
dc.citation.issueNumber1en_US
dc.citation.journalTitleNature Communicationsen_US
dc.citation.volumeNumber15en_US
dc.contributor.authorRen, Zhengen_US
dc.contributor.authorHuang, Jianweien_US
dc.contributor.authorTan, Hengxinen_US
dc.contributor.authorBiswas, Ananyaen_US
dc.contributor.authorPulkkinen, Akien_US
dc.contributor.authorZhang, Yichenen_US
dc.contributor.authorXie, Yaofengen_US
dc.contributor.authorYue, Ziqinen_US
dc.contributor.authorChen, Leien_US
dc.contributor.authorXie, Fangen_US
dc.contributor.authorAllen, Kevinen_US
dc.contributor.authorWu, Hanen_US
dc.contributor.authorRen, Qiruien_US
dc.contributor.authorRajapitamahuni, Anilen_US
dc.contributor.authorKundu, Asish K.en_US
dc.contributor.authorVescovo, Elioen_US
dc.contributor.authorKono, Junichiroen_US
dc.contributor.authorMorosan, Emiliaen_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorZhu, Jian-Xinen_US
dc.contributor.authorSi, Qimiaoen_US
dc.contributor.authorMinár, Jánen_US
dc.contributor.authorYan, Binghaien_US
dc.contributor.authorYi, Mingen_US
dc.contributor.orgSmalley-Curl Instituteen_US
dc.date.accessioned2024-11-20T15:52:06Zen_US
dc.date.available2024-11-20T15:52:06Zen_US
dc.date.issued2024en_US
dc.description.abstractMagnetic kagome materials provide a fascinating playground for exploring the interplay of magnetism, correlation and topology. Many magnetic kagome systems have been reported including the binary FemXn (X = Sn, Ge; m:n = 3:1, 3:2, 1:1) family and the rare earth RMn6Sn6 (R = rare earth) family, where their kagome flat bands are calculated to be near the Fermi level in the paramagnetic phase. While partially filling a kagome flat band is predicted to give rise to a Stoner-type ferromagnetism, experimental visualization of the magnetic splitting across the ordering temperature has not been reported for any of these systems due to the high ordering temperatures, hence leaving the nature of magnetism in kagome magnets an open question. Here, we probe the electronic structure with angle-resolved photoemission spectroscopy in a kagome magnet thin film FeSn synthesized using molecular beam epitaxy. We identify the exchange-split kagome flat bands, whose splitting persists above the magnetic ordering temperature, indicative of a local moment picture. Such local moments in the presence of the topological flat band are consistent with the compact molecular orbitals predicted in theory. We further observe a large spin-orbital selective band renormalization in the Fe $${{{{\rm{d}}}}}_{{xy}}+{{{{\rm{d}}}}}_{{x}^{2}-{y}^{2}}$$spin majority channel reminiscent of the orbital selective correlation effects in the iron-based superconductors. Our discovery of the coexistence of local moments with topological flat bands in a kagome system echoes similar findings in magic-angle twisted bilayer graphene, and provides a basis for theoretical effort towards modeling correlation effects in magnetic flat band systems.en_US
dc.identifier.citationRen, Z., Huang, J., Tan, H., Biswas, A., Pulkkinen, A., Zhang, Y., Xie, Y., Yue, Z., Chen, L., Xie, F., Allen, K., Wu, H., Ren, Q., Rajapitamahuni, A., Kundu, A. K., Vescovo, E., Kono, J., Morosan, E., Dai, P., … Yi, M. (2024). Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film. Nature Communications, 15(1), 9376. https://doi.org/10.1038/s41467-024-53722-3en_US
dc.identifier.digitals41467-024-53722-3en_US
dc.identifier.doihttps://doi.org/10.1038/s41467-024-53722-3en_US
dc.identifier.urihttps://hdl.handle.net/1911/118064en_US
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.titlePersistent flat band splitting and strong selective band renormalization in a kagome magnet thin filmen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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