{"title":"Anderson-Higgs amplitude mode in Josephson junctions","authors":"P. Vallet, J. Cayssol","doi":"10.1103/physrevb.110.024517","DOIUrl":null,"url":null,"abstract":"The Anderson-Higgs mode in a superconductor corresponds to a collective and coherent oscillation of the order parameter amplitude. We propose to detect this mode in a tunnel Josephson junction between two singlet <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi></math>-wave diffusive superconductors in presence of a THz external irradiation at angular frequency <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>ω</mi></math>. By solving the Keldysh-Usadel equations, we obtain that the current-voltage relation exhibits a series of peaks of which only a subset is enhanced by the Anderson-Higgs mode. Furthermore, at zero bias, the junction features an ac current oscillating at <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>2</mn><mi>ω</mi></mrow></math>, which is resonant when <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>ℏ</mi><mi>ω</mi></mrow></math> hits the superconducting gap, thereby indicating the activation of the Anderson-Higgs mode.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7000,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review B","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physrevb.110.024517","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Physics and Astronomy","Score":null,"Total":0}
引用次数: 0
Abstract
The Anderson-Higgs mode in a superconductor corresponds to a collective and coherent oscillation of the order parameter amplitude. We propose to detect this mode in a tunnel Josephson junction between two singlet -wave diffusive superconductors in presence of a THz external irradiation at angular frequency . By solving the Keldysh-Usadel equations, we obtain that the current-voltage relation exhibits a series of peaks of which only a subset is enhanced by the Anderson-Higgs mode. Furthermore, at zero bias, the junction features an ac current oscillating at , which is resonant when hits the superconducting gap, thereby indicating the activation of the Anderson-Higgs mode.
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