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Significantly, the interplay between strong correlations and charge transfer not only stabilizes the antiferromagnetic ground state but also endows the material with enriched properties, particularly in optics. Herein, we demonstrate a 2D antiferromagnetic charge-transfer Mott insulator, Vanadium Oxychloride (VOCl), which shows giant third-harmonic generation (THG) anisotropy (\n                    <jats:italic>\u03c1<\/jats:italic>\n                    <jats:sub>THG<\/jats:sub>\n                    \u2009=\u2009\n                    <jats:italic>I<\/jats:italic>\n                    <jats:sub>x<\/jats:sub>\n                    \/\n                    <jats:italic>I<\/jats:italic>\n                    <jats:sub>y<\/jats:sub>\n                    , where\n                    <jats:italic>I<\/jats:italic>\n                    <jats:sub>x<\/jats:sub>\n                    and\n                    <jats:italic>I<\/jats:italic>\n                    <jats:sub>y<\/jats:sub>\n                    represent the THG intensities corresponding to the excitation polarization parallel to crystal\u2019s\n                    <jats:italic>x<\/jats:italic>\n                    - and\n                    <jats:italic>y<\/jats:italic>\n                    -axes), with\n                    <jats:italic>\u03c1<\/jats:italic>\n                    <jats:sub>THG<\/jats:sub>\n                    reaching up to 187 at 1280\u2009nm excitation wavelength. Notably, it is the highest THG anisotropic ratio within the van der Waals materials family. The nonlinear anisotropy is further modulated across a broadband infrared (IR) excitation wavelength range from 2028 to 1280\u2009nm, during which\n                    <jats:italic>\u03c1<\/jats:italic>\n                    <jats:sub>THG<\/jats:sub>\n                    rises from 2.6 to 187, corresponding to a 72-fold enhancement relative to its value at 2028\u2009nm. Additionally, VOCl demonstrates layer-independent third-order susceptibilities (\u03c7\n                    <jats:sup>(3)<\/jats:sup>\n                    \u2009~\u200910\n                    <jats:sup>-19<\/jats:sup>\n                    m\n                    <jats:sup>2<\/jats:sup>\n                    \/V\n                    <jats:sup>2<\/jats:sup>\n                    ) and band structures attributed to its extremely weak interlayer electronic coupling. Moreover, the colossal THG anisotropic ratio in 2D VOCl can be ascribed to the synergistic effect of the correlated charge-transfer Mott insulator behavior and intrinsic\n                    <jats:italic>C<\/jats:italic>\n                    <jats:sub>3<\/jats:sub>\n                    symmetry breaking, as supported by theoretical calculations. The colossal nonlinear optical anisotropy in 2D VOCl positions it as an excellent candidate for nanophotonic and optoelectronic applications, enabling next-generation nanodevices based on 2D correlated Mott insulators.\n                  <\/jats:p>","DOI":"10.1038\/s41377-025-02130-3","type":"journal-article","created":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T03:14:58Z","timestamp":1767842098000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Colossal infrared nonlinear optical anisotropy in a 2D charge-transfer Mott insulator"],"prefix":"10.1038","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4999-9735","authenticated-orcid":false,"given":"Ruihuan","family":"Duan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Song","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaodong","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-1423-7097","authenticated-orcid":false,"given":"Yao","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sicheng","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuan","family":"Mao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenduo","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaodan","family":"Lyu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-3809-1647","authenticated-orcid":false,"given":"Youqiang","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fakun","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lishu","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ya","family":"Deng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6752-5299","authenticated-orcid":false,"given":"Manzhang","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanchao","family":"He","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayu","family":"Shi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenting","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangtong","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3971-621X","authenticated-orcid":false,"given":"Weibo","family":"Gao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9771-5293","authenticated-orcid":false,"given":"Zhipei","family":"Sun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xingji","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9910-1455","authenticated-orcid":false,"given":"Qi Jie","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8825-7198","authenticated-orcid":false,"given":"Zheng","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,1,8]]},"reference":[{"key":"2130_CR1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.adn6216","volume":"10","author":"L Yue","year":"2024","unstructured":"Yue, L. et al. 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