{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T10:33:36Z","timestamp":1790764416277,"version":"4.1.0"},"reference-count":41,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2025,10,2]],"date-time":"2025-10-02T00:00:00Z","timestamp":1759363200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,10,2]],"date-time":"2025-10-02T00:00:00Z","timestamp":1759363200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12025409"],"award-info":[{"award-number":["12025409"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002367","name":"Chinese Academy of Sciences","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100002367","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012492","name":"Youth Innovation Promotion Association","doi-asserted-by":"publisher","award":["2021008"],"award-info":[{"award-number":["2021008"]}],"id":[{"id":"10.13039\/501100012492","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["advanced.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Advanced Materials"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Optical materials primarily refer to transparent insulators and semiconductors for guiding, diffracting, and nonlinearly\u2010generating light at photon energies below the electronic bandgaps. This work proposes\u00a0that a solid can be equally lossless, above the fundamental bandgap, in an energy interval dubbed the hypergap, when the conduction and valence bands are well\u2010isolated. The optics within the hypergap could defy the conventional rules and limits set by the bandgap materials, including the low\u2010loss negative permittivity unavailable in existing metals, the anomalous\u2010dispersion phase matching in crystals without birefringence or microstructures, as well as the negative group\u2010velocity dispersion across the visible spectrum unattainable in known dielectrics. High\u2010throughput searches are performed in comprehensive material databases, predict over a hundred hypergap candidates, and experimentally verify one of them. Therefore, hypergap materials might lead to lower loss plasmonic metamaterials, easier wavelength converters in nonlinear optics, and simpler pulse stretchers or compressors in ultrafast optics, potentially transforming optics with unexplored material opportunities.<\/jats:p>","DOI":"10.1002\/adma.202512769","type":"journal-article","created":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T05:29:56Z","timestamp":1759469396000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Hypergap Optical Materials"],"prefix":"10.1002","volume":"38","author":[{"given":"Xiaolei","family":"Hu","sequence":"first","affiliation":[{"name":"Institute of Physics Chinese Academy of Sciences\/Beijing National Laboratory for Condensed Matter Physics Beijing 100190 China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiang","family":"Guo","sequence":"additional","affiliation":[{"name":"Institute of Physics Chinese Academy of Sciences\/Beijing National Laboratory for Condensed Matter Physics Beijing 100190 China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhengran","family":"Wu","sequence":"additional","affiliation":[{"name":"Institute of Physics Chinese Academy of Sciences\/Beijing National Laboratory for Condensed Matter Physics Beijing 100190 China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kun","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Physics Chinese Academy of Sciences\/Beijing National Laboratory for Condensed Matter Physics Beijing 100190 China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xintian","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Physics Chinese Academy of Sciences\/Beijing National Laboratory for Condensed Matter Physics Beijing 100190 China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhilin","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Physics Chinese Academy of Sciences\/Beijing National Laboratory for Condensed Matter Physics Beijing 100190 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8781-5979","authenticated-orcid":false,"given":"Ling","family":"Lu","sequence":"additional","affiliation":[{"name":"Institute of Physics Chinese Academy of Sciences\/Beijing National Laboratory for Condensed Matter Physics Beijing 100190 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,2]]},"reference":[{"key":"e_1_2_12_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-0-08-055630-7.50017-1"},{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1201\/9781420050196"},{"key":"e_1_2_12_3_1","volume-title":"Optical Properties of Solids","author":"Fox M.","year":"2010"},{"key":"e_1_2_12_4_1","volume-title":"Handbook of nonlinear optical crystals","author":"Dmitriev V. 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