Print Email Facebook Twitter Evidence of a Nonequilibrium Distribution of Quasiparticles in the Microwave Response of a Superconducting Aluminum Resonator Title Evidence of a Nonequilibrium Distribution of Quasiparticles in the Microwave Response of a Superconducting Aluminum Resonator Author De Visser, P.J. Goldie, D.J. Diener, P. Withington, S. Baselmans, J.J.A. Klapwijk, T.M. Faculty Applied Sciences Department QN/Quantum Nanoscience Date 2014-01-28 Abstract In a superconductor, absorption of photons with an energy below the superconducting gap leads to redistribution of quasiparticles over energy and thus induces a strong nonequilibrium quasiparticle energy distribution. We have measured the electrodynamic response, quality factor, and resonant frequency of a superconducting aluminium microwave resonator as a function of microwave power and temperature. Below 200 mK, both the quality factor and resonant frequency decrease with increasing microwave power, consistent with the creation of excess quasiparticles due to microwave absorption. Counterintuitively, above 200 mK, the quality factor and resonant frequency increase with increasing power. We demonstrate that the effect can only be understood by a nonthermal quasiparticle distribution. To reference this document use: http://resolver.tudelft.nl/uuid:e3698cf8-d03d-4916-81e2-204747542887 DOI https://doi.org/10.1103/PhysRevLett.112.047004 Publisher American Physical Society ISSN 0031-9007 Source http://link.aps.org/doi/10.1103/PhysRevLett.112.047004 Source Physical Review Letters, 112 (4), 2013 Part of collection Institutional Repository Document type journal article Rights © 2014 American Physical Society Files PDF deVisser_2014.pdf 475.02 KB Close viewer /islandora/object/uuid:e3698cf8-d03d-4916-81e2-204747542887/datastream/OBJ/view