Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.48: Poster

Monday, March 17, 2025, 15:00–18:00, P4

Dynamic Control of Dielectric Loss in Amorphus Solids at Low Temperatures — •Marc Hyps, Christian Ständer, Jan Blickberndt, Andreas Fleischmann, Andreas Reiser, and Christian Enss — Kirchhoff Institute for Physics, Heidelberg University

The main influence on the low temperature behaviour of amorphous solids is determined by atomic tunneling systems (TSs). TSs can be described by the phenomenological standard tunneling model (STM). The STM assums the TSs to be broadly distributed in their energy splitting. Experimental investigations of atomic tunneling systems gained recent interest due to their deteriorative effects in superconducting quantum devices, such as increased noise and decoherence.
We use newly designed and microfabricated superconducting LC-resonator to study the dielectric rf-response of an amorphous sample in the presence of an electric bias field. The bias field is applied via an electrode placed above the resonator chip wich modifies the energy splitting of the TSs. With this setup we are able to prove the non-equillibrium Landau-Zener dynamics with two different measurement protocols. Aditionally we apply two symetrically detuned pump tones. These resulted in an inversion of the population difference between ground and exited state, hence gain. Also an additional loss contribution was found, hinting towards a coupling to nuclear quadrupol moments.

Keywords: Superconducting Resonator; Two Level System; Non-linear Dynamics