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Adv."],"published-print":{"date-parts":[[2026,8,7]]},"abstract":"<jats:p>\n                    Flat electronic bands enable fascinating emergent phenomena such as superconductivity and charge orders. A prevailing approach to realizing flat bands is to engineer lattice geometric constraints in twisted or kagome-like materials. An alternative approach is to utilize purely electronic-interaction-driven flat bands, yet a fundamental challenge is that extreme flatness requires ultrastrong interaction strength, which often leads to incoherent states. Here we demonstrate the concurrent formation of an interaction-driven flat band at the Fermi level and a\n                    <jats:inline-formula>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:msqrt>\n                            <mml:mn>3<\/mml:mn>\n                          <\/mml:msqrt>\n                          <mml:mo>\u00d7<\/mml:mo>\n                          <mml:msqrt>\n                            <mml:mn>3<\/mml:mn>\n                          <\/mml:msqrt>\n                          <mml:mi>R<\/mml:mi>\n                          <mml:mn>30<\/mml:mn>\n                          <mml:mo mathvariant=\"bold\">\u00b0<\/mml:mo>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    charge order in a van der Waals magnet Fe\n                    <jats:sub>5<\/jats:sub>\n                    GeTe\n                    <jats:sub>2<\/jats:sub>\n                    using high-resolution angle-resolved photoemission spectroscopy. This charge order is manifested by band folding within 30 meV below the Fermi level, with its nesting driven by flat bands. The presence of this flat band throughout the Brillouin zone and the logarithmic temperature dependence of its spectral weight suggest a phenomenological Kondo-like, coherent Fermi liquid emerging from strong correlations. Our work establishes a paradigm where an interaction-driven flat band promotes large-scale electronic ordering.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aeg5930","type":"journal-article","created":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T17:59:18Z","timestamp":1786125558000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Interaction-driven flat band and charge order in Fe\n                    <sub>5<\/sub>\n                    GeTe\n                    <sub>2<\/sub>"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5992-4871","authenticated-orcid":true,"given":"Qiang","family":"Gao","sequence":"first","affiliation":[{"name":"Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-5217-8489","authenticated-orcid":true,"given":"Gabriele","family":"Berruto","sequence":"additional","affiliation":[{"name":"Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7360-4564","authenticated-orcid":true,"given":"Khanh Duy","family":"Nguyen","sequence":"additional","affiliation":[{"name":"Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaowei","family":"Hu","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Washington, Seattle, Washington 98195, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5773-6188","authenticated-orcid":true,"given":"Paul","family":"Malinowski","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Washington, Seattle, Washington 98195, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoran","family":"Lin","sequence":"additional","affiliation":[{"name":"Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-7207-5268","authenticated-orcid":true,"given":"Beomjoon","family":"Goh","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9299-6241","authenticated-orcid":true,"given":"Bo Gyu","family":"Jang","sequence":"additional","affiliation":[{"name":"Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin 17104, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0348-2095","authenticated-orcid":true,"given":"Xiaodong","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Washington, Seattle, Washington 98195, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0282-9325","authenticated-orcid":true,"given":"Peter","family":"Littlewood","sequence":"additional","affiliation":[{"name":"James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA."},{"name":"School of Physics and Astronomy, University of St Andrews, N Haugh, St Andrews KY16 9SS, United 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