{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T14:45:28Z","timestamp":1791902728796,"version":"4.3.4"},"reference-count":40,"publisher":"American Physical Society (APS)","issue":"14","license":[{"start":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T00:00:00Z","timestamp":1775606400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000006","name":"Office of Naval Research","doi-asserted-by":"publisher","award":["N00014-20-1-2325"],"award-info":[{"award-number":["N00014-20-1-2325"]}],"id":[{"id":"10.13039\/100000006","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000879","name":"Alfred P. 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A promising approach involves coupling excitons to photons in optical cavities to create exciton polaritons, where effective photon-photon interactions are mediated by the intrinsic excitonic nonlinearity. However, realizing strong polariton nonlinearities within a scalable architecture remains a significant experimental challenge. Here, we demonstrate highly nonlinear two-dimensional exciton polaritons by coupling a charge-tunable\n                    <a:math xmlns:a=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <a:mrow>\n                        <a:msub>\n                          <a:mrow>\n                            <a:mi>MoSe<\/a:mi>\n                          <\/a:mrow>\n                          <a:mrow>\n                            <a:mn>2<\/a:mn>\n                          <\/a:mrow>\n                        <\/a:msub>\n                      <\/a:mrow>\n                    <\/a:math>\n                    monolayer to a planar photonic crystal nanocavity. The pronounced excitonic resonance of the monolayer, combined with its seamless integration with the planar nanocavity, facilitates robust exciton-photon hybridization. Remarkably, the strong mode confinement of the nanocavity substantially enhances polariton-polariton interactions, enabling all-optical switching of the cavity spectrum with excitation energies as low as\n                    <c:math xmlns:c=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <c:mrow>\n                        <c:mo>\u223c<\/c:mo>\n                        <c:mn>4<\/c:mn>\n                        <c:mtext>\u2009<\/c:mtext>\n                        <c:mtext>\u2009<\/c:mtext>\n                        <c:mi>fJ<\/c:mi>\n                      <\/c:mrow>\n                    <\/c:math>\n                    \u2014several orders of magnitude below previously reported thresholds in 2D exciton-polariton systems. Pump-probe spectroscopy reveals that this switching operates on an ultrafast timescale of a few picoseconds. Our Letter establishes a robust platform for nonlinear 2D polaritonics with broad applications in integrated photonic technologies, including all-optical neuromorphic computing and quantum photonic information processing.\n                  <\/jats:p>","DOI":"10.1103\/gc15-qsvf","type":"journal-article","created":{"date-parts":[[2026,2,13]],"date-time":"2026-02-13T15:30:41Z","timestamp":1770996641000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Strongly Nonlinear Nanocavity Exciton Polaritons in Gate-Tunable Monolayer Semiconductors"],"prefix":"10.1103","volume":"136","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6410-2776","authenticated-orcid":true,"given":"Zhi","family":"Wang","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00b30xv10","id-type":"ROR","asserted-by":"publisher"}],"name":"University of 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