Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 12: Bosonic Quantum Gases III (joint session Q/A)
A 12.7: Vortrag
Dienstag, 12. März 2024, 12:30–12:45, Aula
Entrainment of a continuous time crystal — Anton Bölian1, •Phatthamon Kongkhambut1, Jim Skulte1, Ludwig Mathey1, Jayson G. Cosme3, Hans Keßler2, and Andreas Hemmerich1 — 1Zentrum für Optische Quantentechnologien and Institut für Quantenphysik, Universität Hamburg, Germany. — 2Physikalisches Institut der Universität Bonn, Germany. — 3National Institute of Physics, University of the Philippines, Diliman, Quezon City, Philippines.
Discrete and continuous time crystals are novel dynamical many-body states, that are characterized by robust self-sustained oscillations, emerging via spontaneous breaking of discrete or continuous time translation symmetry. Here, we demonstrate dynamical control of a continuous time crystal by driving it into a discrete time crystalline state. This transition is related to subharmonic entrainment of classical limit cycles, which arises here on the level of many-body quantum systems. Specifically, we prepare a continuous time crystal in a pumped atom-cavity system oscillating at a frequency ωCTC and subsequently modulate the continuous pump intensity with a frequency ωdr close to 2 ωCTC. For sufficiently large modulation strengths, the emission frequency switches from ωCTC to ωCTC = ωdr/2, which demonstrates the phase transition to a discrete time crystal.
Keywords: Open Quantum Systems; Hybrid Quantum Systems; Cavity QED; BEC