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Symmetry breaking in low dimensional system enables the emergence of non\u2010linear optical responses, which are greatly amplified by the singular points of band inversion. Here, using first\u2010principles calculations, the significant enhancement of the shift current in Bi nanotubes is investigated, driven by the combined effects of 1D geometry and non\u2010trivial band order. By rolling a 2D Bi monolayer, which exhibits a quantum spin Hall phase, into a 1D nanotube, an extraordinarily large shift current of 4.94 A\u00b7\u00c5<jats:sup>2<\/jats:sup>\u00a0V<jats:sup>\u22122<\/jats:sup> is generated, two orders of magnitude larger than the experimental values in WS<jats:sub>2<\/jats:sub> nanotubes. The enhancement of the shift current in Bi nanotubes is demonstrated and attributed to the state mixing induced by the interplay of strong spin\u2010orbit coupling, the curvature of the tube, and the non\u2010trivial band order of Bi nanotubes. The robustness of this enhanced shift current against various perturbations is also discussed, such as oxidation and doping. The novel approach integrating non\u2010trivial band order with reduced dimensionality sheds new light on advanced photovoltaic applications by harnessing both geometric advantages and exotic electronic structures for energy conversion.<\/jats:p>","DOI":"10.1002\/smll.202409249","type":"journal-article","created":{"date-parts":[[2024,12,12]],"date-time":"2024-12-12T06:35:17Z","timestamp":1733985317000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Colossal Shift Currents in Band\u2010Inverted Bi Nanotubes Driven by the Interplay of Curvature and Spin\u2010Orbit Coupling"],"prefix":"10.1002","volume":"21","author":[{"given":"Ikpyeong","family":"Park","sequence":"first","affiliation":[{"name":"Department of Physics Incheon National University  Incheon 22012 South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyung\u2010Hwan","family":"Jin","sequence":"additional","affiliation":[{"name":"Department of Physics and Research Institute for Materials and Energy Sciences Jeonbuk National University  Jeonju 54896 South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyoung\u2010Whan","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics Yonsei University  Seoul 03722 South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4070-1878","authenticated-orcid":false,"given":"Jeongwoo","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics Incheon National University  Incheon 22012 South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,12,11]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.116.237402"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41563-019-0297-4"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41563-019-0296-5"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.93.081403"},{"key":"e_1_2_9_5_1","volume":"12","author":"Qian C.","year":"2022","journal-title":"Phys. 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