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Q: Fachverband Quantenoptik und Photonik

Q 52: Floquet Engineering and Topology

Q 52.3: Talk

Thursday, March 9, 2023, 15:15–15:30, E001

Observation of a dissipative time crystal — •Phatthamon Kongkhambut1, Hans Keßler1, Jim Skulte1, Ludwig Mathey1, Jayson G. Cosme2, and Andreas Hemmerich11Zentrum für Optische Quantentechnologien and Institut für Laser-Physik, Universität Hamburg, 22761 Hamburg, Germany. — 2National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines.

We are experimentally exploring the light-matter interaction of a Bose-Einstein condensate (BEC) with a single light mode of an ultra-high finesse optical cavity. The key feature of our cavity is the small field decay rate (κ/2π=3.5 kHz), which is in the order of the recoil frequency (ωrec/2π=3.6 kHz). This leads to a unique situation where cavity field evolves with the same time scale as the atomic distribution. If the system is pumped transversally with a steady state light field, red detuned with respect to the atomic resonance, the Hepp-Lieb superradiant phase transition of the open Dicke is realized [1]. Starting in this self-ordered density wave phase and modulating the amplitude of the pump field, we observe a dissipative discrete time crystal, whose signature is a robust subharmonic oscillation between two symmetry broken states [2].

[1] J. Klinder et al., PNAS 112, 3290-3295 (2015).

[2] H. Keßler et al., PRL 127, 043602 (2021).

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