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Optomechanical effects in superfluid properties of BEC in an optical lattice

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Verma P., Bhattacherjee A., Mohan M.
Open Physics
|
2013
|
vol. 11
|
issue 1
96-105
EN
We investigate the effects of a movable mirror (cantilever) of an optical cavity on the superfluid properties and the Mott phase boundary of a Bose-Einstein condensate (BEC) in an optical lattice. The Bloch energy, effective mass, Bogoliubov energy and the superfluid fraction are modified due to the mirror motion. The mirror motion is also found to modify the Mott-superfluid phase boundaries. This study reveals that the mirror emerges as a new handle to coherently control the superfluid properties of the BEC.
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Bistability of Feshbach resonance in optical cavity

100%
Xu X.-Q., Li Y.-Q.
Open Physics
|
2014
|
vol. 12
|
issue 6
427-432
EN
We consider Feshbach resonance in an optical cavity where photons interact with atoms and molecules dispersively. From mean-field theory we obtain multiple fixed-point solutions, which is strongly related to the phenomenon of bistability. Adiabatic evolutions demonstrate hysteretic behaviors by varying pump-cavity detuning from opposite directions. We also use the quantum model to check mean-field results which match perfectly. The analysis here may enrich the study of particle-photon interaction systems.
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