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Phys.: Condens. Matter"],"published-print":{"date-parts":[[2026,9,11]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Achieving the coexistence of valley polarization and nontrivial band topology is a central challenge in two-dimensional (2D) valleytronics. Here, we combine first-principles calculations, an effective\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:mi>k<\/mml:mi>\n                          <mml:mo>\u22c5<\/mml:mo>\n                          <mml:mi>p<\/mml:mi>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    model, and crystal-field analysis to develop a unified physical picture of biaxial-strain-driven topological phase transitions in the Janus ferrovalley monolayer FeClBr. First-principles calculations reveal a complete phase-transition sequence. A strain-dependent two-band\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:mi>k<\/mml:mi>\n                          <mml:mo>\u22c5<\/mml:mo>\n                          <mml:mi>p<\/mml:mi>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    model yields the condition for topological nontriviality\u2014opposite signs of the renormalized band gaps at the two valleys\u2014reproducing the full five-stage sequence within a minimal framework. Crystal-field analysis further identifies the microscopic origin: strain, through symmetry-selective modulation, drives orbital inversion, while spin\u2013orbit coupling imparts valley-dependent effective-gap shifts that cause the inversions to occur at different critical strains, opening a topologically nontrivial window between them. Our work establishes a complete causal chain from strain to topology and offers general design guidelines for engineering topological valley-polarized states in related 2D magnetic materials.\n                  <\/jats:p>","DOI":"10.1088\/1361-648x\/ae9fa8","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T22:53:39Z","timestamp":1787871219000},"page":"365501","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Strain-induced quantum anomalous valley Hall phase in Janus FeClBr monolayer: effective model and crystal-field mechanism"],"prefix":"10.1088","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9876-9277","authenticated-orcid":true,"given":"Jing","family":"Wang","sequence":"first","affiliation":[{"name":"Nankai University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenli","family":"Zhang","sequence":"additional","affiliation":[{"name":"Nankai University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiru","family":"Yang","sequence":"additional","affiliation":[{"name":"Nankai University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peixuan","family":"Liu","sequence":"additional","affiliation":[{"name":"Nankai University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Shao","sequence":"additional","affiliation":[{"name":"Nankai University"},{"name":"Nankai University"},{"name":"Shenzhen Research Institute of Nankai University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9440-1021","authenticated-orcid":true,"given":"Xu","family":"Zuo","sequence":"additional","affiliation":[{"name":"Nankai University"},{"name":"Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin"},{"name":"Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,9,8]]},"reference":[{"key":"cmae9fa8bib1","doi-asserted-by":"publisher","first-page":"666","DOI":"10.1126\/science.1102896","type":"journal-article","volume":"306","author":"Novoselov","year":"2004","journal-title":"Science"},{"key":"cmae9fa8bib2","doi-asserted-by":"publisher","first-page":"183","DOI":"10.1038\/nmat1849","type":"journal-article","volume":"6","author":"Geim","year":"2007","journal-title":"Nat. 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