Quasiparticle Relaxation in Optically Excited High-Q Superconducting Resonators

Journal article (2008)
Department
Kavli Institute of Nanoscience (AS) (TU Delft)
Copyright: © Barends, R. et al. ; American Physical Society
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Published Date

25-06-2008

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Source:

Physical Review Letters, 100 (25), 2008

Faculty

Applied Sciences

Department

Kavli Institute of Nanoscience

Abstract

The quasiparticle relaxation time in superconducting films has been measured as a function of temperature using the response of the complex conductivity to photon flux. For tantalum and aluminum, chosen for their difference in electron-phonon coupling strength, we find that at high temperatures the relaxation time increases with decreasing temperature, as expected for electron-phonon interaction. At low temperatures we find in both superconducting materials a saturation of the relaxation time, suggesting the presence of a second relaxation channel not due to electron-phonon interaction.

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