DPG Phi
Verhandlungen
Verhandlungen
DPG

Erlangen 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Gases I

Q 20.1: Poster

Dienstag, 15. März 2022, 16:30–18:30, P

Dissipative time crystals in an atom-cavity system — •Phatthamon Kongkhambut1, Hans Keßler1, Jim Skulte1,2, Ludwig Mathey1,2, Jayson G. Cosme3, and Andreas Hemmerich1,21Institut für Laser-Physik, Universität Hamburg — 2The Hamburg Center for Ultrafast Imaging — 3National Institute of Physics, University of the 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 = 4.5kHz), which is in the order of the recoil frequency (ωrec/2π = 3.6kHz). This leads to a unique situation where cavity field evolves with the same timescale as the atomic distribution. If the system is pumped with a steady state light field, red detuned with respect to the atomic resonance, the Dicke model is implemented. 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 [1]. Modulation of the phase of the pump field give rise to an incommensurate time crystalline behaviour [2-3]. For a blue-detuned pump light with respect to the atomic resonance, we propose an experimental realization of limit cycles. Since the model describing the system is time-independent, the emergence of a limit cycle phase heralds the breaking of continuous time-translation symmetry. [1] H. Keßler et al., PRL, 127, 043602 (2021). [2] J. G. Cosme et al., PRA 100, 053615 (2019). [3] P. Kongkhambut et al., arXiv:2108.11113.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2022 > Erlangen