Entropy-Weighted Thermodynamic Coupling and Raman Signatures of Non-Reciprocal Response in Graphene

Entropy-Weighted Thermodynamic Coupling and Raman Signatures of Non-Reciprocal Response in Graphene | 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 Entropy-Weighted Thermodynamic Coupling and Raman Signatures of Non-Reciprocal Response in Graphene Monty dabas This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8954542/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Onsager reciprocity is a cornerstone of near-equilibrium thermodynamics, yet deviations may emerge when coupling between thermodynamic variables becomes strongly asymmetric. Here we develop a multiscale framework in which entropy-weighted thermoelastic interactions generate path-dependent responses that can be probed experimentally. An analytical derivation predicts asymmetric cross-derivative behaviour, supported by atomic-scale modelling that reveals non-reciprocal trends across electronic configurations. To test these ideas experimentally, we perform temperature-dependent Raman spectroscopy on monolayer graphene during controlled heating–cooling cycles. Measurements acquired at CeNSE under a calibrated experimental protocol show reproducible hysteresis in both the G and 2D phonon modes, indicating path-dependent phonon evolution. The agreement between theoretical expectations and spectroscopic observables suggests that entropy-mediated coupling can produce measurable non-reciprocal behaviour in two-dimensional materials. These results provide an experimentally accessible route to exploring thermodynamic asymmetry and may have implications for non-reciprocal thermal transport, quantum materials design and phonon-based information control. Physical sciences/Physics/Condensed-matter physics Physical sciences/Materials science/Condensed-matter physics Full Text Additional Declarations Yes there is potential Competing Interest. Yes. The author has filed a provisional patent application related to non-reciprocal materials described in this work. Supplementary Files StandardOperatingProcedure.docx Experimental Standard Operating Procedure for Temperature-Dependent Raman Measurements of Monolayer Graphene Cite Share Download PDF Status: Posted 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. 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