arXiv:quant-ph/0412166 · Physical Review Letters

Creating Ground State Molecules with Optical Feshbach Resonances in Tight Traps

Christiane P. Koch, Françoise Masnou-Seeuws, Ronnie Kosloff

Published May 17, 2005• 26 citations

Abstract

We propose to create ultracold ground state molecules in an atomic Bose-Einstein condensate by adiabatic crossing of an optical Feshbach resonance. We envision a scheme where the laser intensity and possibly also frequency are linearly ramped over the resonance. Our calculations for (87)Rb show that for sufficiently tight traps it is possible to avoid spontaneous emission while retaining adiabaticity, and conversion efficiencies of up to 50% can be expected.

DOI: 10.1103/physrevlett.94.193001

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arXiv:quant-ph/0412166 · Physical Review Letters

Creating Ground State Molecules with Optical Feshbach Resonances in Tight Traps

Christiane P. Koch, Françoise Masnou-Seeuws, Ronnie Kosloff

Published May 17, 2005• 26 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physrevlett.94.193001

Related papers

Full optical preparation of an absolute ground-state ultracold CsYb molecule via laser-assisted self-induced Feshbach resonance

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^{87}\mathrm{Rb}^{84}\mathrm{Sr}

bosonic molecules. A first possibility is photoassociation followed by spontaneous emission. The photoassociation rate coefficients toward electronic states converging to the

^{87}\mathrm{Rb}(5s\phantom{\rule{0.16em}{0ex}}^{2}S_{1/2})+^{84}\mathrm{Sr}(5s5p\phantom{\rule{0.16em}{0ex}}^{3}P_{0,1,2}

) asymptotes are particularly small for vibrational levels close to the asymptote. The creation of molecules would be more interesting by using deeply bound levels which preferentially relax to the ${v}^{\ensuremath{'}\ensuremath{'}}=0$ level of the ground state. On the other hand, the photoassociation rate coefficients toward electronic states correlated to the

\mathrm{Rb}(5p\phantom{\rule{0.16em}{0ex}}^{2}P_{1/2,3/2})+\mathrm{Sr}(5{s}^{2}\phantom{\rule{0.16em}{0ex}}^{1}S_{0}

) are significant for levels close to the asymptote. The spontaneous emission thus creates weakly bound molecules in a single vibrational level. A second option relies on stimulated Raman adiabatic passage implemented in a tight optical trap. It efficiently creates weakly bound ground-state molecules in a well-defined level, thus providing a promising alternative to magnetic Feshbach resonances for further population transfer toward the absolute ground state of the RbSr molecule.

^{88}\mathrm{Sr}

. Dipole-allowed transitions proceeding via the $B\phantom{\rule{0.2em}{0ex}}^{1}{\ensuremath{\Sigma}}_{u}^{+}$ excited state as well as transitions near the intercombination line are studied.