Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Disordered Quantum Systems

TT 25.6: Talk

Tuesday, April 2, 2019, 10:45–11:00, H23

Studying the Dielectric Low Temperature Properties of Amorphous Solids using Biased Resonators — •Benedikt Frey, Diana Körner, Andreas Fleischmann, Andreas Reiser, and Christian Enss — Kirchhoff-Institute for Physics, Heidelberg University, D-69120 Heidelberg

The low temperature properties of amorphous solids are governed by atomic tunneling systems, often described as two-level systems (TLS) with the energy splitting E. Besides the recent interest in these systems, due to their diverse impact on microfabricated quantum devices, such tunneling systems have been studied for many years in amorphous solids and are successfully described in many cases by the phenomenological standard tunneling model.
We use microfabricated superconducting resonators in a bridge-type setup to study the dielectric rf-response of the amorphous substrate in the presence of an electrical bias field. This bias field modifies the energy splitting E of a TLS by coupling to its dipole moment. Consequently, a sweep of the bias field constantly pushes different TLS in resonance with the resonator. We see a correlation between the dielectric function and the bias field sweep rate, which is compared to the simulation results of a Monte Carlo Method approach.