Manipulating Quantum Criticality in Light-induced 2D superconductivity

Manipulating Quantum Criticality in Light-induced 2D superconductivity | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Manipulating Quantum Criticality in Light-induced 2D superconductivity Masayuki Suda, Bin Chen, Kenichiro Hashimoto, Motoi Kimata, Takahiko Sasaki, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4994762/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 24 Jan, 2026 Read the published version in Communications Materials → Version 1 posted You are reading this latest preprint version Abstract The creation and control of two-dimensional (2D) superconductivity in clean systems are pivotal for exploring quantum phase transitions and emergent quantum phenomena. Here, we demonstrate the realization of robust 2D superconductivity on the surface of the bulk organic Mott insulator κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl (κ-Cl) [BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene] by employing a monolayer of a photochromic spiropyran derivative. This approach enables light-driven carrier injection without the need for conventional field-effect device configurations, preserving the material's intrinsic structural integrity. Homogeneous photo-induced doping leads to near clean-limit 2D superconductivity, as evidenced by the observation of the Berezinskii-Kosterlitz-Thouless transition and pronounced anisotropy in the upper critical magnetic fields, indicative of a superconducting phase confined to a few molecular layers. Furthermore, by introducing controlled spatial inhomogeneity in the doping profile through partial photoisomerization, we realize a tunable degree of electronic disorder. This controlled disorder allows access to exotic quantum critical phenomena such as quantum Griffiths singularity (QGS) during the magnetic-field-driven superconductor-insulator transition. Our findings establish a versatile, non-invasive platform for inducing and manipulating 2D superconductivity on bulk crystals, providing new opportunities for studying low-dimensional superconductivity and disorder-enabled quantum phase transitions with high tunability. Physical sciences/Physics/Condensed-matter physics/Superconducting properties and materials Physical sciences/Materials science/Materials for devices/Electronic devices Full Text Additional Declarations There is NO Competing Interest. Cite Share Download PDF Status: Published Journal Publication published 24 Jan, 2026 Read the published version in Communications Materials → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4994762","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":452238462,"identity":"0613ac5e-7a3c-4ca6-a660-1f6bec9db166","order_by":0,"name":"Masayuki 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