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Optomechanical effects in superfluid properties of BEC in an optical lattice

100%
Verma P., Bhattacherjee A., Mohan M.
Open Physics
|
2013
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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.
2
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Oscillations in a parametrically excited Bose-Einstein condensate in combined harmonic and optical lattice trap

100%
Verma P., Bhattacherjee A., Mohan M.
Open Physics
|
2012
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vol. 10
|
issue 2
335-341
EN
In this work, we study parametric excitations in an elongated cigar-shaped BEC in a combined harmonic trap and a time dependent optical lattice by using numerical techniques. We show that there exists a relative competition between the harmonic trap which tries to spatially localize the BEC and the time varying optical lattice which tries to delocalize the BEC. This competition gives rise to parametric excitations (oscillations of the BEC width). Regular oscillations disappear when one of the competing factors, i.e. the strength of harmonic trap or the strength of optical lattice, dominates. Parametric instabilities (chaotic dynamics) arise for large variations in the strength of the optical lattice.
3
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Nondegenerate dual atomic parametric amplifier: entangled atomic fields

88%
Kumar T., Bhattacherjee A., Verma P., Gevorgyan N., Mohan M.
Open Physics
|
2012
|
vol. 10
|
issue 1
132-139
EN
In this paper, we investigate the dynamics of two coupled quantum degenerate atomic fields (BEC) interacting with two classical optical fields in the nonlinear atom optics regime. Two-photon interaction produces entangled atom-atom pairs which exhibit nonclassical correlations. Since the system involves the creation of two correlated atom pairs, we call it the nondegenerate dual atomic parametric amplifier.
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