Controlling Condensate Collapse and Expansion with an Optical Feshbach Resonance
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We demonstrate control of the collapse and expansion of an Sr88 Bose-Einstein condensate using an optical Feshbach resonance near the S01−P13 intercombination transition at 689 nm. Significant changes in dynamics are caused by modifications of scattering length by up to ±10abg, where the background scattering length of Sr88 is abg=−2a0 (1a0=0.053 nm). Changes in scattering length are monitored through changes in the size of the condensate after a time-of-flight measurement. Because the background scattering length is close to zero, blue detuning of the optical Feshbach resonance laser with respect to a photoassociative resonance leads to increased interaction energy and a faster condensate expansion, whereas red detuning triggers a collapse of the condensate. The results are modeled with the time-dependent nonlinear Gross-Pitaevskii equation.
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Yan, Mi, DeSalvo, B.J., Ramachandhran, B., et al.. "Controlling Condensate Collapse and Expansion with an Optical Feshbach Resonance." Physical Review Letters, 110, no. 12 (2013) American Physical Society: 123201. http://dx.doi.org/10.1103/PhysRevLett.110.123201.