2013/10/05 by Yiwen Wang, Pinjia Zhou, Lianfu Wei +6
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1063/1.4826271
published as J. Appl. Phys. 114, 153109 (2013) · Accepted by the Journal of Applied Physics
arxiv created 2013/10/05 · arxiv updated 2013/10/28
We experimentally investigated the optical responses of a superconducting niobium resonator. It was found that, with increasing radiation power, the resonance frequency increases monotonically below around 500 mK, decreases monotonically above around 1 K and exhibits a nonmonotonic behavior at around 700 mK. These observations show that one can operate the irradiated resonator in three temperature regimes, depending on whether two-level system (TLS) effects or kinetic inductance effects dominate. Furthermore, we found that the optical responses at ultra-low temperatures can be qualitatively regarded as a photon-induced thermalization effect of TLSs, which could be utilized to achieve thermal sensitive photon detections.