{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T06:09:05Z","timestamp":1784786945225,"version":"3.55.0"},"reference-count":48,"publisher":"IOP Publishing","issue":"3","license":[{"start":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T00:00:00Z","timestamp":1784764800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T00:00:00Z","timestamp":1784764800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"DOI":"10.13039\/501100004359","name":"Swedish Research Council","doi-asserted-by":"crossref","award":["2022-06725"],"award-info":[{"award-number":["2022-06725"]}],"id":[{"id":"10.13039\/501100004359","id-type":"DOI","asserted-by":"crossref"}]},{"name":"National Academic Infrastructure for Supercomputing in Sweden","award":["2022-06725"],"award-info":[{"award-number":["2022-06725"]}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["2D Mater."],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"Abstract<\/jats:title>\n \n MnBi\n \n \n \n <\/jats:tex-math>\n \n \n \n \n 2<\/mml:mn>\n <\/mml:msub>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n Te\n \n \n \n <\/jats:tex-math>\n \n \n \n \n 4<\/mml:mn>\n <\/mml:msub>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n (MBT) thin films provide a unique material platform in which magnetism, topology, and magneto-optical (MO) response can be tuned through layer-thickness and relative spin alignments. In this work, using a low-energy coupled Dirac cone model together with a Wannier-based tight-binding Hamiltonian derived from\n ab-initio<\/jats:italic>\n calculations, we investigate topological MO switching in even-layered MBT films. We argue that the relative spin alignment of the outermost septuple-layers (SLs) provides the primary microscopic control of the total Chern number, optical conductivity, and consequently, the MO response. For a 6-SL MBT thin film, we found that reversing the outermost-SL alignments from antiparallel to parallel switches the system from an axion insulating state with\n \n \n \n <\/jats:tex-math>\n \n \n C<\/mml:mi>\n =<\/mml:mo>\n 0<\/mml:mn>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n and vanishing Faraday rotation to a Chern insulating state with\n \n \n \n <\/jats:tex-math>\n \n \n C<\/mml:mi>\n =<\/mml:mo>\n 1<\/mml:mn>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n and a quantized MO response, irrespective of the\n \n \n \n <\/jats:tex-math>\n \n \n P<\/mml:mi>\n T<\/mml:mi>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n -symmetry and net magnetization. Increasing the thickness reveals an additional regime: while 8-SL MBT hosts only\n \n \n \n <\/jats:tex-math>\n \n \n C<\/mml:mi>\n =<\/mml:mo>\n 0<\/mml:mn>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n and\n \n \n \n <\/jats:tex-math>\n \n \n C<\/mml:mi>\n =<\/mml:mo>\n 1<\/mml:mn>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n states, a 12-SL MBT film supports a higher Chern number phase with\n \n \n \n <\/jats:tex-math>\n \n \n C<\/mml:mi>\n =<\/mml:mo>\n 2<\/mml:mn>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n , exhibiting a doubled low-frequency Faraday rotation owing to additional Berry-curvature contributions from adjacent near-surface SLs. Our results provide a thickness-dependent route to multilevel MO switching and establish MO spectroscopy as a direct probe of magnetism and topological order in MBT thin films.\n <\/jats:p>","DOI":"10.1088\/2053-1583\/ae8b03","type":"journal-article","created":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T22:48:58Z","timestamp":1784155738000},"page":"031001","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Topological magneto-optical switching in even-layered MnBi\n 2<\/sub>\n Te\n 4<\/sub>"],"prefix":"10.1088","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4409-0100","authenticated-orcid":true,"given":"Shahid","family":"Sattar","sequence":"first","affiliation":[{"name":"Linnaeus University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2559-7598","authenticated-orcid":false,"given":"Roman","family":"Stepanov","sequence":"additional","affiliation":[{"name":"Linnaeus University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4489-7561","authenticated-orcid":false,"given":"C M","family":"Canali","sequence":"additional","affiliation":[{"name":"Linnaeus University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,7,23]]},"reference":[{"key":"tdmae8b03bib1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.122.206401","type":"journal-article","article-title":"Topological axion states in the magnetic insulator MnBi 2Te 4 with the quantized magnetoelectric effect","volume":"122","author":"Zhang","year":"2019","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":"2026-05-21","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-07-15","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-07-23","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}