Observation of exciton-vibron coupling in cold dense nitrogen

Observation of exciton-vibron coupling in cold dense nitrogen | 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 Physical Sciences - Article Observation of exciton-vibron coupling in cold dense nitrogen Li Lei, Binbin Wu, Jingyi Liu, Yu Tao This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4816305/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 Cold dense matter (CDM) exhibits unique quantum states or effects, and the quantum correlation effects in dense nitrogen become significant at low temperatures, which provides an opportunity to explore the matter under cold dense conditions. The optical band gap (Eg) of dense nitrogen gradually closes with increasing pressure, eventually leading to the metallization. At the same time, the exciton energy (Ex) also gradually decreases as the Eg decreases, this process may trigger a new quantum correlation transition correlated with the exciton coupling. Here we designed a state-of-the-art isothermal-compression Raman spectroscopy technology to probe vibrational properties in cold dense nitrogen, and clearly observed vibron fluctuations and phonon stiffening when we isothermally compressed the solid nitrogen above 130 GPa at below 150 K. This phenomenon is believed to be related to the pressure-driven exciton-vibron coupling in cold dense nitrogen due to the excitonic interaction can enhanced at low temperature, and the exciton binding energies and their lifetimes can be modified. We defined the exciton-vibron coupling state as the new μ-N2 phase, and also identified its pressure-temperature (P-T) phase boundaries. Our finding not only provides experimental basis for the existence of exciton-vibron coupling in cold dense nitrogen, but also provides a clear and manageable context for exploring complex interactions under extreme conditions. Physical sciences/Optics and photonics/Optical techniques/Optical spectroscopy/Raman spectroscopy Physical sciences/Physics/Condensed-matter physics/Electronic properties and materials Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SupplementaryInformation.docx Supplementary Information 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. 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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-4816305","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Physical Sciences - Article","associatedPublications":[],"authors":[{"id":340747528,"identity":"6f46697c-5a0c-4af6-981d-810e7150a266","order_by":0,"name":"Li Lei","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAApUlEQVRIiWNgGAWjYBACPgbGxgcQZgKRWtgYGJsNSNXCwCZBohb25rbKHzWHGfjZcwwYfu4gRgvPwbbbPMcOM0j2vDFg7D1DjBaJxLbbjA2HGQxu5BgwM7YRo0X+YVvhT6AWe+K1SACV8YJskSBaC09iszTPsXQeiTPPCg72EqOFn/34w48/aqzl+NuTNz74SYwWGOABEQdI0DAKRsEoGAWjAB8AAPBBL1whbOMkAAAAAElFTkSuQmCC","orcid":"https://orcid.org/0000-0002-8649-2928","institution":"Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China","correspondingAuthor":true,"prefix":"","firstName":"Li","middleName":"","lastName":"Lei","suffix":""},{"id":340747529,"identity":"274c223f-0041-4745-a27c-2eabdc222212","order_by":1,"name":"Binbin Wu","email":"","orcid":"","institution":"Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China","correspondingAuthor":false,"prefix":"","firstName":"Binbin","middleName":"","lastName":"Wu","suffix":""},{"id":340747530,"identity":"0e87de6d-e493-4872-845f-cbba733317f2","order_by":2,"name":"Jingyi Liu","email":"","orcid":"","institution":"Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China","correspondingAuthor":false,"prefix":"","firstName":"Jingyi","middleName":"","lastName":"Liu","suffix":""},{"id":340747531,"identity":"a7dc25f6-33c4-4585-9086-5666bdfaa464","order_by":3,"name":"Yu Tao","email":"","orcid":"","institution":"Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China","correspondingAuthor":false,"prefix":"","firstName":"Yu","middleName":"","lastName":"Tao","suffix":""}],"badges":[],"createdAt":"2024-07-28 10:40:23","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-4816305/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-4816305/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":64603971,"identity":"590a24d3-3098-46eb-a613-604d63a77c39","added_by":"auto","created_at":"2024-09-16 12:41:35","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1241628,"visible":true,"origin":"","legend":"Article File","description":"","filename":"Manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-4816305/v1_covered_452e2ea0-eeed-49b0-a3ca-e7fe1b00c6a2.pdf"},{"id":64603339,"identity":"3cbdd88c-dbeb-4e8a-ad2c-d6fb2c849f3e","added_by":"auto","created_at":"2024-09-16 12:33:32","extension":"docx","order_by":1,"title":"","display":"","copyAsset":false,"role":"supplement","size":2423958,"visible":true,"origin":"","legend":"Supplementary Information","description":"","filename":"SupplementaryInformation.docx","url":"https://assets-eu.researchsquare.com/files/rs-4816305/v1/d3c518cc48f7f91bfe925e20.docx"}],"financialInterests":"There is \u003cb\u003eNO\u003c/b\u003e Competing Interest.","formattedTitle":"Observation of exciton-vibron coupling in cold dense nitrogen","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"nature-portfolio","isNatureJournal":true,"hasQc":false,"allowDirectSubmit":false,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"","title":"Nature Portfolio","twitterHandle":"","acdcEnabled":false,"dfaEnabled":false,"editorialSystem":"ejp","reportingPortfolio":"","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"","lastPublishedDoi":"10.21203/rs.3.rs-4816305/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4816305/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"Cold dense matter (CDM) exhibits unique quantum states or effects, and the quantum correlation effects in dense nitrogen become significant at low temperatures, which provides an opportunity to explore the matter under cold dense conditions. The optical band gap (Eg) of dense nitrogen gradually closes with increasing pressure, eventually leading to the metallization. At the same time, the exciton energy (Ex) also gradually decreases as the Eg decreases, this process may trigger a new quantum correlation transition correlated with the exciton coupling. Here we designed a state-of-the-art isothermal-compression Raman spectroscopy technology to probe vibrational properties in cold dense nitrogen, and clearly observed vibron fluctuations and phonon stiffening when we isothermally compressed the solid nitrogen above 130 GPa at below 150 K. This phenomenon is believed to be related to the pressure-driven exciton-vibron coupling in cold dense nitrogen due to the excitonic interaction can enhanced at low temperature, and the exciton binding energies and their lifetimes can be modified. We defined the exciton-vibron coupling state as the new μ-N2 phase, and also identified its pressure-temperature (P-T) phase boundaries. 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