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Adv."],"published-print":{"date-parts":[[2026,7,17]]},"abstract":"<jats:p>\n                    Halide perovskites have soft lattices with strong interactions between electronic and structural degrees of freedom, making them promising for next-generation optoelectronics. Recent studies have uncovered their unique photo- and thermally induced optical behavior, yet the potential for dynamic, optical switching remains underexplored. Here, we demonstrate reversible and diametrically opposite optical switching in single-crystal cesium lead bromide (CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    ), driven independently by either above-bandgap illumination or thermal excitation. We measure tunable changes in mid-infrared transmission from 3 to 20 micrometers, exceeding 10% at 20 micrometers, with opposite polarity under light and heat, and modulation times &lt;1 millisecond. This antithetical behavior arises from a polaron-like lattice distortion under illumination (reducing transmission), and from lattice expansion from heating partnered with the material\u2019s negative thermo-optic coefficient (increasing transparency). Our findings establish inorganic halide perovskites as a viable material platform for reconfigurable photonics where transmission can be controlled independently through distinct mechanisms intrinsic to their soft lattices.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aeb1442","type":"journal-article","created":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T18:03:21Z","timestamp":1784138601000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Opposite and reversible optical switching in soft-lattice halide perovskites using light and heat"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6772-3295","authenticated-orcid":true,"given":"Mansha","family":"Dubey","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering, University of California, Davis, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2234-6112","authenticated-orcid":true,"given":"Tristan J.","family":"Deppe","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, University of California, Davis, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9238-4029","authenticated-orcid":true,"given":"Andrii","family":"Kanak","sequence":"additional","affiliation":[{"name":"Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Z\u00fcrich, Z\u00fcrich CH-8093, Switzerland."},{"name":"Empa-Swiss Federal Laboratories for Materials Science and Technology, D\u00fcbendorf CH-8600, Switzerland."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7080-6953","authenticated-orcid":true,"given":"Abigail 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V.","family":"Escobar","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, University of California, Davis, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6396-8938","authenticated-orcid":true,"given":"Maksym V.","family":"Kovalenko","sequence":"additional","affiliation":[{"name":"Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Z\u00fcrich, Z\u00fcrich CH-8093, Switzerland."},{"name":"Empa-Swiss Federal Laboratories for Materials Science and Technology, D\u00fcbendorf CH-8600, Switzerland."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0881-9876","authenticated-orcid":true,"given":"Jeremy N.","family":"Munday","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, University of California, Davis, CA, 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