Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Poster Session: Cryotechnique

TT 54.3: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3

A novel bridge-type radio frequency resonator for studying two level system dynamics under electric dc bias at low temperatures — •Sven Lutter, Benedikt Frey, Andreas Fleischmann, Andreas Reiser, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, D-69120 Heidelberg

The low temperature behavior of solids is well described by the standard tunneling model. Hereby, two level systems (TLS) are the dominant excitation in the solid. TLSs carrying an electric dipole moment couple to external electric fields and consequently can be studied in dielectric experiments. In particular, the application of an electric dc field is used to provide new insight into the TLS non-equilibrium dynamics.

We have developed a novel bridge-type radio frequency resonator. The capacitors of this resonator are arranged in a Wheatstone bridge-like configuration. Across one bridge diagonal the coil is attached, across the other the dc bias. The resonator is coupled inductively to the feed line and read out by a network analyzer.

We show first results on the optical glass N-BK7 for temperatures between a few millikelvins and several kelvins.