A high phase-space density mixture of 87Rb and 133Cs: towards ultracold heteronuclear molecules

Abstract

Publisher's copyright statement:The original publication is available at www.springerlink.com Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Cs respectively, we measure a high interspecies three-body inelastic collision rate ∼ 10 −24 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 Cs2 molecules via magneto-association on the 4g(4) resonance at 19.8 G. These results represent important steps towards the creation of ultracold RbCs molecules in our apparatus.

Production of Ultracold 87Rb133Cs in the Absolute Ground State: Complete Characterisation of the Stimulated Raman Adiabatic Passage Transfer

“…Typically the gas consists of ∼ 3 × 10 5 of each species at ∼ 300 nK. Details of our apparatus and cooling method can be found in our previous publications [33,34,35]. We produce weakly bound molecules on the Feshbach resonance at 197 G and use Stern-Gerlach separation in the | − 2(1, 3)d(0, 3) state at 181 G to remove the unbound atoms, as has been documented in [36].…”

Dual-species Bose-Einstein condensate ofRb87andCs133McCarron1, Cho2, Jenkin3 et al. 2011Phys. Rev. ASelf Cite248122680View full textAdd to dashboardCite

“…The trap depth set by the rf frequency is three times greater for 133 Cs than for 87 Rb and therefore allows the selective removal of hot 87 Rb atoms. As the 87 Rb gas is cooled we observe efficient sympathetic cooling of 133 Cs via interspecies elastic collisions [32]. The efficiency, γ , ranges from 5.2 (4) initial and final phase-space densities (numbers), respectively].…”

Creation of UltracoldRb87Cs133Molecules in the Rovibrational Ground Sta

“…Details of the apparatus have been described in our studies of dual-species condensates [34,35] and Feshbach spectroscopy [30,31]. In this work we use a nearly degenerate sample of ∼2.5 × 10 5 87 Rb atoms in the jf ¼ 1; m f ¼ 1i state and ∼2.0 × 10 5 133 Cs atoms in the j3; 3i state, confined in the levitated dipole trap illustrated in Fig.…”