Crossover between Ballistic and Diffusive Quantum Transport in Bi2Se3 Nanoribbon Devices

Crossover between Ballistic and Diffusive Quantum Transport in Bi2Se3 Nanoribbon Devices | 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 Crossover between Ballistic and Diffusive Quantum Transport in Bi2Se3 Nanoribbon Devices Kiryl Niherysh, Nermin Trnjanin, Ananthu P. Surendran, Gunta Kunakova, and 8 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8535082/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 We study quantum interference effects in hybrid devices consisting of topological insulator Bi2Se3 nanoribbons contacted by two Al electrodes. Conductance oscillations as a function of bias and gate voltage reveal a distinct crossover in transport behavior. For junctions narrower than 500 nm, the oscillation periodicity matches the junction width, consistent with Fabry-Perot interference and quasi-ballistic transport over nearly micrometer scales. In contrast, wider devices exhibit irregular, quasi-periodic oscillations that we attribute to universal conductance fluctuations, signaling a transition to diffusive transport as the junction width becomes too large for transverse quantization to govern the interference pattern. Complementary Josephson current measurements confirm that ballistic modes persist over long distances, far beyond what magnetotransport suggests. These findings highlight the sensitivity of Fabry-Perot interference and Josephson current probes to ballistic transport channels. Physical sciences/Nanoscience and technology Physical sciences/Physics Full Text Additional Declarations No competing interests reported. Supplementary Files CrossoverbetweenBallisticandDiffusiveQuantumTransportinBi2Se3NanoribbonDevicesSupplementary.pdf 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. 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-8535082","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":579615091,"identity":"fdb9cebe-2adb-4764-a40a-20c6dffbaf22","order_by":0,"name":"Kiryl Niherysh","email":"","orcid":"","institution":"Chalmers University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Kiryl","middleName":"","lastName":"Niherysh","suffix":""},{"id":579615092,"identity":"05966382-6269-4807-8e6c-9297da102857","order_by":1,"name":"Nermin Trnjanin","email":"","orcid":"","institution":"Chalmers University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Nermin","middleName":"","lastName":"Trnjanin","suffix":""},{"id":579615093,"identity":"850247bc-b8b0-4d27-8d81-c1c0c7cf0886","order_by":2,"name":"Ananthu P. 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