Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Ultracold Atoms I (joint session Q/A)
A 35.5: Vortrag
Donnerstag, 8. März 2018, 11:30–11:45, K 1.022
Synchronization-assisted cooling of atomic ensembles — •Simon B. Jäger1, Minghui Xu2,3, Stefan Schütz4, John Cooper2,3, Murray Holland2,3, and Giovanna Morigi1 — 1Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — 2JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA — 3Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA — 4icFRC, IPCMS (UMR 7504), ISIS (UMR 7006), Université de Strasbourg and CNRS, 67000 Strasbourg, France
We analyze the dynamics leading to radiative cooling of an atomic ensemble inside an optical cavity when the atomic dipolar transitions are incoherently pumped. Our study is performed in the regime where the cavity decay is the largest rate in the system. Using a semiclassical approximation we identify three stages of cooling. At first hot atoms are cooled by the cavity friction forces. After this stage, the atoms’ center-of-mass motion is further cooled by the coupling to the internal degrees of freedom while the dipoles synchronize. In the latest stage dipole-dipole correlations are stationary and the center-of-mass motion is determined by the interplay between friction and dispersive forces due to the coupling with the collective dipole. For this final stage we derive a mean-field model that is valid on a timescale where particle-particle correlations build up slowly. On this timescale we observe that the system can reach momentum widths below the recoil limit. Beside this we find limit cycles and chaotic dynamics.