SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Poster II
Q 22.8: Poster
Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof
Dynamical phases in an atom-cavity system: From time crystals to dark states — •Jim Skulte1,2, Phatthamon Kongkhambut1, Richelle J.L. Tuquero3, Hans Keßler1, Jayson G. Cosme3, Andreas Hemmerich1,2, and Ludwig Mathey1,2 — 1Zentrum für Optische Quantentechnologien and Institut für Laser-Physik, Universität Hamburg, 22761 Hamburg, Germany. — 2The Hamburg Center for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany. — 3National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101, Philippines.
Ultracold atoms placed inside a high finesse optical cavity, which are continuously pumped or periodically driven display very rich phase diagrams. We specifically discover non-equilibrium phases called time crystals emerging in this platform. Time crystals are classified as discrete or continuous depending on whether they spontaneously break discrete or continuous time translation symmetry. First, we study an emergent limit cycle phase for a blue-detuned pump and show that this state can be classified as a continuous time crystal [1]. On the other hand, phase shaking of the pump beam can be used to map the system onto a parametrically driven dissipative three-level Dicke model [2]. For weak driving this leads an incommensurate time crystal, while for strong driving this state is only metastable and relaxes into a dark state [3]. [1] P. Kongkhambut et al., Science 377, 6606 (2022)
[2] J. Skulte et al., PRA 127, 253601 (2021)
[3] J. Skulte et al., arXiv:2209.03342 (2022)