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Phys.: Condens. Matter"],"published-print":{"date-parts":[[2026,10,16]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Driven by their unique lattice structure, Kagome systems exhibit fascinating properties, prominent among which is the emergence of flat bands. Here we report a scanning tunneling microscopy and spectroscopy study on the lateral finite-size effect of flat-band spectral weight in the Kagome metal CoSn. We identify two distinct cleaved surfaces: Co\n                    <jats:sub>3<\/jats:sub>\n                    Sn and Sn\n                    <jats:sub>2<\/jats:sub>\n                    . On the Co\n                    <jats:sub>3<\/jats:sub>\n                    Sn surface, we detect two electronic peaks located at 70 and 250 mV below the Fermi level, which correspond to the flat bands originating from Co\n                    <jats:italic>d<\/jats:italic>\n                    orbitals. Notably, the flat-band intensity exhibits a strong dependence on the lateral size of the Kagome islands. The flat bands start to emerge in Co\n                    <jats:sub>3<\/jats:sub>\n                    Sn islands consisting of only a half-unit-wide Kagome chain. As the island width increases, the flat-band intensity rises exponentially and reaches saturation when the island width reaches four-unit cells or larger. By analyzing the size-dependent intensity data, we extract the characteristic length scale for this saturation behavior. Furthermore, on the large Co\n                    <jats:sub>3<\/jats:sub>\n                    Sn surface, we observe a broad and non-dispersive wavevector with a periodicity close to \u221a3\u00d7\u221a3 in the Fourier-transformed differential conductance maps. These results not only reveal the novel lateral finite-size effect of flat-band spectral weight at the atomic scale, but also pave the way for a deeper understanding of the complex electronic structures in Kagome materials.\n                  <\/jats:p>","DOI":"10.1088\/1361-648x\/aeadff","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T22:54:31Z","timestamp":1790722471000},"page":"415601","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Lateral finite-size effect of flat-band spectral weight in Kagome metal CoSn"],"prefix":"10.1088","volume":"38","author":[{"given":"Weixiong","family":"Hu","sequence":"first","affiliation":[{"name":"ShanghaiTech University"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"data-curation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"}]},{"given":"Huanyu","family":"Liu","sequence":"additional","affiliation":[{"name":"ShanghaiTech University"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"data-curation","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Zhongzheng","family":"Yang","sequence":"additional","affiliation":[{"name":"ShanghaiTech University"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"data-curation","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Xuefeng","family":"Zhang","sequence":"additional","affiliation":[{"name":"ShanghaiTech University"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"}]},{"given":"Wenxin","family":"Lv","sequence":"additional","affiliation":[{"name":"Renmin University of China"},{"name":"Renmin University of China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5956-2073","authenticated-orcid":true,"given":"Chenhaoping","family":"Wen","sequence":"additional","affiliation":[{"name":"ShanghaiTech University"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"data-curation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0952-5909","authenticated-orcid":true,"given":"Gang","family":"Li","sequence":"additional","affiliation":[{"name":"ShanghaiTech University"},{"name":"ShanghaiTech University"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0850-8514","authenticated-orcid":true,"given":"Hechang","family":"Lei","sequence":"additional","affiliation":[{"name":"Renmin University of China"},{"name":"Renmin University of China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7318-300X","authenticated-orcid":true,"given":"Shichao","family":"Yan","sequence":"additional","affiliation":[{"name":"ShanghaiTech University"},{"name":"ShanghaiTech University"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]}],"member":"266","published-online":{"date-parts":[[2026,10,14]]},"reference":[{"key":"cmaeadffbib1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.124.086401","type":"journal-article","volume":"124","author":"Zhao","year":"2020","journal-title":"Phys. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2026-06-30","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-09-29","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-10-14","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}