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Department of Physics

Staff profile

Publication details for Prof Simon Cornish

Köppinger, M.P., Gregory, P.D., Jenkin, D.L., McCarron, D.J., Marchant, A.L. & Cornish, S.L. (2014). Repeated output coupling of ultracold Feshbach molecules from a Cs BEC. New Journal of Physics 16(11): 115016.

Author(s) from Durham


Part of Focus on New Frontiers of Cold Molecules Research
We investigate magnetoassociation of ultracold Feshbach molecules from a Bose-Einstein condensate of Cs atoms and explore the spectrum of weakly bound molecular states close to the atomic threshold. By exploiting the variation of magnetic field experienced by a molecular cloud falling in the presence of a magnetic field gradient, we demonstrate the repeated output coupling of molecules from a single atomic cloud using a Feshbach resonance at 19.89 G. Using this method we are able to produce up to 24 separate pulses of molecules from a single atomic condensate, with a molecular pulse created every 7.2 ms. Furthermore, by careful control of the magnetic bias field and gradient we are able to utilise an avoided crossing in the bound state spectrum at 13.3 G to demonstrate exquisite control over the dynamics of the molecular clouds.