Journal
EUROPEAN PHYSICAL JOURNAL D
Volume 65, Issue 1-2, Pages 125-131Publisher
SPRINGER
DOI: 10.1140/epjd/e2011-10716-1
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Funding
- EPSRC [GR/S78339/01, EP/E041604/1, EP/H03363/1]
- European Science Foundation
- Royal Society
- Engineering and Physical Sciences Research Council [EP/I012044/1, EP/H003363/1, EP/E041604/1, GR/S78339/01] Funding Source: researchfish
- EPSRC [EP/E041604/1, EP/H003363/1, EP/I012044/1] Funding Source: UKRI
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We report the production of a high phase-space density mixture of Rb-87 and Cs-133 atoms in a levitated crossed optical dipole trap as the first step towards the creation of ultracold RbCs molecules via magneto-association. We present a simple and robust experimental setup designed for the sympathetic cooling of Cs-133 via interspecies elastic collisions with Rb-87. Working with the |F = 1,m (F) = +1 > and the |3, +3 > states of Rb-87 and Cs-133 respectively, we measure a high interspecies three-body inelastic collision rate similar to 10(-25)-10(-26) cm(6) s(-1) which hinders the sympathetic cooling. Nevertheless by careful tailoring of the evaporation we can produce phase-space densities near quantum degeneracy for both species simultaneously. In addition we report the observation of an interspecies Feshbach resonance at 181.7(5) G and demonstrate the creation of Cs-2 molecules via magneto-association on the 4(g)4 resonance at 19.8 G. These results represent important steps towards the creation of ultracold RbCs molecules in our apparatus.
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