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Phys.: Condens. Matter"],"published-print":{"date-parts":[[2025,3,31]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Monolayer atomic thin films of group-V elements have a high potential for application in spintronics and valleytronics because of their unique crystal structure and strong spin\u2013orbit coupling. We fabricated Sb and Bi monolayers on a SiC(0001) substrate by the molecular-beam-epitaxy method and studied the electronic structure by angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. The fabricated Sb film shows the (\u221a3 \u00d7 \u221a3)<jats:italic>R<\/jats:italic>30\u00b0 superstructure associated with the formation of <jats:italic>\u03b1<\/jats:italic>-Sb, and exhibits a semiconducting nature with a band gap of more than 1.8 eV. Spin-resolved ARPES measurements of isostructural <jats:italic>\u03b1<\/jats:italic>-Bi revealed the in-plane spin polarization for the topmost valence band, demonstrating its Rashba-splitting nature due to the space-inversion-symmetry breaking. We discuss the origin of observed characteristic band structure and its similarity and difference between Sb and Bi.<\/jats:p>","DOI":"10.1088\/1361-648x\/ada981","type":"journal-article","created":{"date-parts":[[2025,1,17]],"date-time":"2025-01-17T11:37:30Z","timestamp":1737113850000},"page":"135501","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Role of spin\u2013orbit coupling for the band splitting in \u03b1-Sb and \u03b1-Bi on SiC(0001)"],"prefix":"10.1088","volume":"37","author":[{"given":"Ken","family":"Yaegashi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2926-9436","authenticated-orcid":true,"given":"Katsuaki","family":"Sugawara","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takashi","family":"Takahashi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4544-5463","authenticated-orcid":true,"given":"Takafumi","family":"Sato","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2025,2,10]]},"reference":[{"key":"cmada981bib1","doi-asserted-by":"publisher","first-page":"3045","DOI":"10.1103\/RevModPhys.82.3045","volume":"82","author":"Hasan","year":"2010","journal-title":"Rev. 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