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1
Content available remote Oscillations in a parametrically excited Bose-Einstein condensate in combined harmonic and optical lattice trap
100%
Verma P. , Bhattacherjee A. , Mohan M.
Open Physics
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2012
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tom 10
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nr 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.
2
Content available remote Optomechanical effects in superfluid properties of BEC in an optical lattice
100%
Verma P. , Bhattacherjee A. , Mohan M.
Open Physics
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2013
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tom 11
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nr 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.
3
Content available remote Probing superfluidity of periodically trapped ultracold atoms in a cavity by transmission spectroscopy
100%
Bhattacherjee A. , Kumar T. , Mohan M.
Open Physics
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2010
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tom 8
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nr 5
850-853
EN
We study a system of periodic Bose-condensed atoms coupled to cavity photons using the input-output formalism of [14]. We show for the first time that the cavity will either act as a through-pass Lorentzian filter when the superfluid fraction of the condensate is minimum, or completely reflect the input field when the superfluid fraction is maximum. We show that by monitoring the ratio between the transmitted field and the reflected field, one can estimate the superfluid fraction.
4
Content available remote Nondegenerate dual atomic parametric amplifier: entangled atomic fields
88%
Kumar T. , Bhattacherjee A. , Verma P. , Gevorgyan N. , Mohan M.
Open Physics
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2012
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tom 10
|
nr 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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