Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Quantum Gases: Bosons IV
Q 27.4: Vortrag
Dienstag, 24. März 2015, 15:15–15:30, P/H2
Universal Dynamics in Finite-Temperature Unitary Bose Gases — •Ulrich Eismann1,2,3, Lev Khaykovich4, Igor Ferrier-Barbut1, Sébastien Laurent1, Benno S. Rem1, Andrew T. Grier1, Li-Chung Ha2, Frédéric Chevy1, Cheng Chin2, and Christophe Salomon1 — 1LKB, ENS, UPMC, CNRS UMR 8552, 24 rue Lhomond, 75231 Paris, France — 2JFI and Department of Physics, University of Chicago, Chicago, IL 60637, USA — 3Now with TOPTICA Photonics AG, Lochhamer Schlag 19, 82166 Graefelfing, Germany — 4Department of Physics, Bar-Ilan University, Ramat-Gan, 52900 Israel
The low temperature unitary Bose gas is a fundamental paradigm in few-body and many-body physics, attracting wide theoretical and experimental interest. We briefly introduce a theory describing the dynamic interplay of two-body evaporation and three-body recombination in a trapped unitary atomic gas. We identify a magic trap depth where, within some parameter range, evaporative cooling is balanced by the recombinational heating such that the gas temperature stays constant. We perform independent experiments with 133Cs and 7Li atoms tuned to Feshbach resonances. These fully support the predictions of the model and enable quantitative measurements of both the trap depth, and the 3-body recombination rate in the low-temperature domain. We verify the validity of the universal dynamics for both species, for 2D and 3D evaporation, over two orders of magnitude in temperature and four orders of magnitude in three-body loss.