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dc.contributor.authorTakahashi, Korekiyo
dc.contributor.authorNakatsugawa, Keiji
dc.contributor.authorSakoda, Masahito
dc.contributor.authorNanao, Yoshiko
dc.contributor.authorNobukane, Hiroyoshi
dc.contributor.authorObuse, Hideaki
dc.contributor.authorTanda, Satoshi
dc.identifier.citationTakahashi , K , Nakatsugawa , K , Sakoda , M , Nanao , Y , Nobukane , H , Obuse , H & Tanda , S 2023 , ' Bose glass and Fermi glass ' , Scientific Reports , vol. 13 , no. 1 , 12434 .
dc.identifier.otherPURE: 291725013
dc.identifier.otherPURE UUID: d6ae054c-85aa-4fe2-8f97-2f4853adf468
dc.identifier.otherJisc: 1244116
dc.identifier.otherpublisher-id: s41598-023-39285-1
dc.identifier.othermanuscript: 39285
dc.identifier.otherORCID: /0000-0002-0376-2903/work/139964801
dc.identifier.otherScopus: 85166048193
dc.description.abstractIt is known that two-dimensional superconducting materials undergo a quantum phase transition from a localized state to superconductivity. When the disordered samples are cooled, bosons (Cooper pairs) are generated from Fermi glass and reach superconductivity through Bose glass. However, there has been no universal expression representing the transition from Fermi glass to Bose glass. Here, we discovered an experimental renormalization group flow from Fermi glass to Bose glass in terms of simple β-function analysis. To discuss the universality of this flow, we analyzed manifestly different systems, namely a Nd-based two-dimensional layered perovskite and an ultrathin Pb film. We find that all our experimental data for Fermi glass fall beautifully into the conventional self-consistent β-function. Surprisingly, however, flows perpendicular to the conventional β-function are observed in the weakly localized regime of both systems, where localization becomes even weaker. Consequently, we propose a universal transition from Bose glass to Fermi glass with the new two-dimensional critical sheet resistance close to R□=h/e2.
dc.relation.ispartofScientific Reportsen
dc.rightsCopyright © The Author(s) 2023. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
dc.subjectQC Physicsen
dc.titleBose glass and Fermi glassen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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