143 citations · 1k across the 21 of their papers we have counts for
9 papers · 1 filter
Strong Reduction of Quasiparticle Fluctuations in a Superconductor due to Decoupling of the Quasiparticle Number and Lifetime
Steven A. H. de Rooij, Jochem J. A. Baselmans, Vignesh Murugesan +2
We measure temperature dependent quasiparticle fluctuations in a small Al volume, embedded in a NbTiN superconducting microwave resonator. The resonator design allows for read-out…
Direct evidence for Cooper pairing without a spectral gap in a disordered superconductor above
Koen M. Bastiaans, Damianos Chatzopoulos, Jian-Feng Ge +9
The idea that preformed Cooper pairs could exist in a superconductor above its zero-resistance state has been explored for unconventional, interface, and disordered superconductors…
Coherent excited states in superconductors due to a microwave field
A. V. Semenov, I. A. Devyatov, P. J. de Visser +1
We describe theoretically the depairing effect of a microwave field on diffusive s-wave superconductors. The ground state of the superconductor is altered qualitatively in analogy…
Anomalous response of superconducting titanium nitride resonators to terahertz radiation
J. Bueno, P. C. J. J. Coumou, G. Zheng +5
We present an experimental study of KIDs fabricated of atomic layer deposited TiN films, and characterized at radiation frequencies of ~GHz. The responsivity to radiation is m…
Fluctuations in the electron system of a superconductor exposed to a photon flux
P. J. de Visser, J. J. A. Baselmans, J. Bueno +2
We report on fluctuations in the electron system, Cooper pairs and quasiparticles, of a superconducting aluminium film. The superconductor is exposed to pair-breaking photons (1.54…
Evidence of a nonequilibrium distribution of quasiparticles in the microwave response of a superconducting aluminium resonator
P. J. de Visser, D. J. Goldie, P. Diener +3
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 non-equilibri…
Power Handling and Responsivity of Submicron Wide Superconducting Coplanar Waveguide Resonators
R. M. J. Janssen, A. Endo, J. J. A. Baselmans +3
The sensitivity of microwave kinetic inductance detectors (MKIDs) based on coplanar waveguides (CPWs) needs to be improved by at least an order of magnitude to satisfy the requirem…
Strongly disordered TiN and NbTiN s-wave superconductors probed by microwave electrodynamics
E. F. C. Driessen, P. C. J. J. Coumou, R. R. Tromp +2
We probe the effects of strong disorder (2.4 < kFl < 8.6) on superconductivity in thin films of niobium titanium nitride and titanium nitride by measuring the microwave electrodyna…
Microwave-induced excess quasiparticles in superconducting resonators measured through correlated conductivity fluctuations
P. J. de Visser, J. J. A. Baselmans, S. J. C. Yates +3
We have measured the number of quasiparticles and their lifetime in aluminium superconducting microwave resonators. The number of excess quasiparticles below 160 mK decreases from…