Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q39: Superconducting Circuits and Devices
3:00 PM–5:48 PM,
Wednesday, March 8, 2023
Room: Room 231
Sponsoring
Unit:
DMP
Chair: Chris Ciccarino, Stanford University
Abstract: Q39.00008 : Observation of two-level systems with a giant dipole moment in superconducting granular aluminum films
4:48 PM–5:00 PM
Presenter:
Maximilian Kristen
(Karlsruhe Institute of Technology)
Authors:
Maximilian Kristen
(Karlsruhe Institute of Technology)
Jan Nicolas Voss
(Karlsruhe Institute of Technology)
Micha Wildermuth
(Karlsruhe Institute of Technology)
Jürgen Lisenfeld
(Karlsruhe Institute of Technology)
Hannes Rotzinger
(Karlsruhe Institute of Technology)
Alexey V Ustinov
(Karlsruhe Institute of Technology)
We present microwave spectroscopy measurements of ultra-compact, high impedance resonators made from granular aluminum films. By applying mechanical strain and electric fields, we observe numerous TLS strongly interacting with the resonator modes. Our analysis of the measured data shows the presence of TLS with a wide distribution of electrical dipole moments. In comparison with similar TLS studies on low impedance superconducting resonators, we observe in addition to the common surface TLS, also a variety of TLS with an unusual, order of magnitude larger dipole moments.
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