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Q: Fachverband Quantenoptik und Photonik
Q 52: Cold atoms VI - traps (joint session A/Q)
Q 52.4: Vortrag
Donnerstag, 8. März 2018, 11:15–11:30, K 0.011
Thermodynamics of a non-equilibrium single-atom system — •Daniel Mayer1, Daniel Adam1, Quentin Bouton1, Steve Haupt1, Tobias Lausch1, Felix Schmidt1, and Artur Widera1, 2 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Gottlieb-Daimler-Strasse 47, 67663 Kaiserslautern, Germany
We report on the experimental investigation of phase space dynamics of individual atoms, quenched out of equilibrium by a Raman cooling pulse. We numerically model our findings by using an effective two-temperature approach, yielding excellent agreement with the experimental data. For application of multiple pulses, we observe the approach of a thermal state with a new temperature.
Experimentally, we prepare a few atom sample of laser cooled Cs atoms in a crossed, optical dipole trap. We apply a pulse of degenerate Raman sideband cooling, thereby quenching the phase space distribution of the sample. The dynamics emerging after the quench is observed by two distinct methods: we extract information about the radial momentum distribution by a release-recapture experiment while in axial direction we use fluorescence imaging in a 1D optical lattice to observe the atomic position distribution.