Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 65: Quantum gases: Bosons III
Q 65.2: Vortrag
Freitag, 22. März 2013, 14:30–14:45, F 342
Universality of the Unitary-Limited Three-Body Loss Rate in Bosonic Systems — •Ulrich Eismann1,2, Li-Chung Ha1, Logan Clark1, Eric Hazlett1, Shih-Huang Tung1, and Cheng Chin1 — 1The James Franck Institute and Department of Physics, University of Chicago, Chicago, IL 60637, USA — 2Laboratoire Kastler Brossel, ENS, UPMC, CNRS UMR 8552, 24 rue Lhomond, 75231 Paris, France
In recent years, the tunability of quantum gases has become an standard experimental tool. It is established by exploiting magnetic Feshbach resonances in alkali atom collisions. In bosonic systems, however, strong interactions are accompanied by enhanced three-body loss, which therefore is an important practical limitation for tuning. However, apart from being a nuisance, three-body loss itself represents an important observable, and can be used to probe nonclassical correlations and few-body physics like the Efimov effect [1].
We present measurements of the temperature-dependent three-body loss rate in ultracold Bose gases at unitarity, where the two-body scattering amplitude becomes resonant. Experimentally, we exploit the d-wave Feshbach resonance near 48 G in the lowest hyperfine ground state of cesium-133. We confirm former measurements performed in the lithium-7 system [2] on a more than ten times higher temperature scale, providing evidence of universality of the unitary three-body loss rate. Given our excellent signal-to noise ratio, we discuss the experimental observability of Efimov-like oscillations in the loss spectrum.
[1] V. Efimov, Phys. Lett. B 33, 563 (1970).
[2] U. Eismann, Ph.D. thesis, Université P. et M. Curie (2012).