Real-space imaging of ultrafast electron dynamics and subsequent crystallographic dynamics via photo-induced phase transition

Real-space imaging of ultrafast electron dynamics and subsequent crystallographic dynamics via photo-induced phase transition | 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 Real-space imaging of ultrafast electron dynamics and subsequent crystallographic dynamics via photo-induced phase transition Keiki Fukumoto, Ken Onda, Takanori Tanaka, Koichi Kusakabe, Hideki Yamochi, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5941274/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Photo-induced phase transition (PIPT) involves substantial changes in both electronic and crystallographic structures caused by electron excitations. Because PIPT is ultrafast and exhibits inhomogeneous behaviour, its fundamental processes, in particular how the ultrafast dynamics of photoexcited electrons trigger lattice deformation and the time scales involved, remain poorly understood. In this study, the dynamics of the photoexcited electrons and the subsequent volume change of organic charge transfer complexes are directly visualised simultaneously in the time and energy domains using photoemission electron microscopy with a femtosecond pulsed laser as the excitation source. The results show that an anisotropic volume change of a few percent is initiated following the accumulation of electrons in unoccupied states over approximately a picosecond. Physical sciences/Materials science/Nanoscale materials/Structural properties Physical sciences/Nanoscience and technology/Techniques and instrumentation/Imaging techniques Full Text Additional Declarations There is NO Competing Interest. Supplementary Files fukumotosi.pdf movie1dec.mp4 Thermally induced phase transition1 movie2inc.mp4 Thermally induced phase transition2 movie3OnOff.mp4 Phase transition by laser irradiation movie4RepRate.mp4 Dependence of phase transition on the laser reperitin rate movie5time.mp4 PIPT at 2kHz movie6time.mp4 PIPT at 20 kHz Cite Share Download PDF Status: Under Review 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-5941274","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":413700171,"identity":"e070cc51-80ac-43ca-85c5-24f46132eb7c","order_by":0,"name":"Keiki 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