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dc.contributor.authorde, Visser PJen
dc.contributor.authorYates, SJCen
dc.contributor.authorGuruswamy, Tejasen
dc.contributor.authorGoldie, Daviden
dc.contributor.authorWithington, Stafforden
dc.contributor.authorNeto, Aen
dc.contributor.authorLlombart, Nen
dc.contributor.authorBaryshev, AMen
dc.contributor.authorKlapwijk, TMen
dc.contributor.authorBaselmans, JJAen
dc.date.accessioned2015-12-21T12:21:45Z
dc.date.available2015-12-21T12:21:45Z
dc.date.issued2015-06-25en
dc.identifier.citationApplied Physics Letters 2015, 106: 252602. doi:10.1063/1.4923097en
dc.identifier.issn0003-6951
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/253064
dc.description.abstractWe have measured the absorption of terahertz radiation in a BCS superconductor over a broad range of frequencies from 200 GHz to 1.1 THz, using a broadband antenna-lens system and a tantalum microwave resonator. From low frequencies, the response of the resonator rises rapidly to a maximum at the gap edge of the superconductor. From there on, the response drops to half the maximum response at twice the pair-breaking energy. At higher frequencies, the response rises again due to trapping of pair-breaking phonons in the superconductor. In practice, this is a measurement of the frequency dependence of the quasiparticle creation efficiency due to pair-breaking in a superconductor. The efficiency, calculated from the different non-equilibrium quasiparticle distribution functions at each frequency, is in agreement with the measurements.
dc.description.sponsorshipWe would like to thank Jan Barkhof for help with the FTS calibration. This work was in part supported by ERC starting Grant Nos. ERC-2009-StG and 240602 TFPA. T. M. Klapwijk acknowledges financial support from the Ministry of Science and Education of Russia under Contract No. 14.B25.31.0007 and from the European Research Council Advanced Grant No. 339306 (METIQUM). P. J. de Visser acknowledges support from a Niels Stensen Fellowship.
dc.languageEnglishen
dc.language.isoenen
dc.publisherAIP
dc.subjectCollective excitationsen
dc.subjectAntennasen
dc.subjectSuperconductorsen
dc.subjectTantalumen
dc.subjectPhononsen
dc.titleThe non-equilibrium response of a superconductor to pair-breaking radiation measured over a broad frequency banden
dc.typeArticle
dc.description.versionThis is the author accepted manuscript. The final version is available from AIP via http://dx.doi.org/10.1063/1.4923097en
prism.number252602en
prism.publicationDate2015en
prism.publicationNameApplied Physics Lettersen
prism.volume106en
rioxxterms.versionofrecord10.1063/1.4923097en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2015-06-25en
dc.contributor.orcidGuruswamy, Tejas [0000-0002-4165-6765]
dc.contributor.orcidGoldie, David [0000-0001-8472-5110]
dc.identifier.eissn1077-3118
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSTFC (ST/J001554/1)


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