Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 39: Quantengase: Wechselwirkungseffekte 2
Q 39.4: Vortrag
Donnerstag, 15. März 2012, 11:30–11:45, V7.01
Three-body recombination in the unitary Bose gas — •Ulrich Eismann1, Igor Ferrier-Barbut1, Andrew Grier1, Tim Langen2, Benno Rem1, Frédéric Chevy1, and Christophe Salomon1 — 1Laboratoire Kastler Brussel, ENS, UPMC, CNRS UMR 8552, 24 rue Lhomond, 75231 Paris, France — 2Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
Three-body recombination is the most fundamental limit of the lifetime of interacting ultra-cold Bose gases. In the low-temperature regime, the interactions between ultra-cold atoms can be described by a single parameter, the s-wave scattering length a. In 1996, an a4 dependence of the recombination loss rate L3 was predicted [1]. However, finite temperatures impose a limit on recombination at unitarity, where |a|→ 0, such that L3 does not diverge [2].
We present temperature-dependent measurements of the unitarity-limited, three-body loss rate. Moreover, by employing the method of [3], we measure the equation of state of the finite-temperature unitary Bose gas.
[1] P. O. Fedichev et al., Phys. Rev. Lett. 77, 2921 (1996)
[2] C. H. Greene et al., Nuclear Physics A737, 119 (2004)
[3] S. Nascimbène et al., Nature 463, 1057 (2010)