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Damping Rate of Josephson Plasmons by Quasiparticle Excitation 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 2013-07-23 en
dc.identifier.issn 0031-9015 en
dc.identifier.uri http://hdl.handle.net/10061/12120 en
dc.description.abstract We investigate the intrinsic damping rate of Josephson plasmons in small tunnel junctions. The effect of interactions between collective modes is calculated on the basis of the perturbative expansion. This expansion is valid for small values of EC/EJEC/EJ (ECEC and EJEJ are the charging and Josephson coupling energies, respectively). The rage of damping by quasiparticle excitation is dependent on this ratio and is qualitatively different from the lowest-order term studied in previous works. The relaxation time is roughly a quadratic function of frequency, which is peculiar to small tunnel junctions. A small value of EC/EJEC/EJ does not necessarily mean a long relaxation time owing to the nonmonotonic dependence of the damping rate on frequency. These nontrivial properties originate from the tunneling term, which depends on frequency and describes both the damping and interaction effects. en
dc.language.iso en en
dc.publisher The Physical Society of Japan en
dc.rights Copyright c 2013 The Physical Society of Japan en
dc.subject quasiparticle excitation en
dc.subject perturbative expansion en
dc.subject tunnel junction en
dc.subject superconducting quantum bit en
dc.subject Josephson plasmon en
dc.subject relaxation time en
dc.title Damping Rate of Josephson Plasmons by Quasiparticle Excitation 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 82 en
dc.identifier.issue 8 en
dc.relation.doi 10.7566/JPSJ.82.084716 en
dc.identifier.artnum 084716 en
dc.identifier.NAIST-ID 73293318 en

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