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Damping Rate of Josephson Plasmons by Photoexcited Quasiparticles in Small Tunnel Junctions

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dc.contributor.author Jujo, Takanobu en
dc.date.accessioned 2017-09-19T05:06:44Z en
dc.date.available 2017-09-19T05:06:44Z en
dc.date.issued 2014-07-28 en
dc.identifier.issn 0031-9015 en
dc.identifier.uri http://hdl.handle.net/10061/12121 en
dc.description.abstract We investigate the quasiparticle excitation by an electromagnetic field in a small tunnel junction and its effect on the damping rate of Josephson plasmons. By the time-dependent path integral method, we formulate the interaction between Josephson plasmons and external fields. Because both quantities are related to each other by the tunneling term, a microscopic derivation of the interaction is important in performing quantitative calculations consistently. We derive an analytical expression for the damping rate in the dispersive region where the oscillating electric field is detuned from Josephson plasmons, and then perform numerical calculations to obtain the relaxation time quantitatively. The result shows that by exciting quasiparticles, the electromagnetic field brings about the decay of Josephson plasmons even in the case that its frequency is lower than twice the superconducting gap. This indicates that there is another source of relaxation besides the spontaneous emission and Purcell effect. en
dc.language.iso en en
dc.publisher The Physical Society of Japan en
dc.rights Copyright c 2014 The Physical Society of Japan en
dc.title Damping Rate of Josephson Plasmons by Photoexcited Quasiparticles in Small Tunnel Junctions en
dc.type.nii Journal Article en
dc.contributor.transcription ジュウジョウ, タカノブ ja
dc.contributor.alternative 重城, 貴信 ja
dc.textversion author en
dc.identifier.jtitle Journal of the Physical Society of Japan en
dc.identifier.volume 83 en
dc.identifier.issue 8 en
dc.relation.doi 10.7566/JPSJ.83.084713 en
dc.identifier.artnum 084713 en
dc.identifier.NAIST-ID 73293318 en


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