4 research outputs found
Experimental investigation of optical atom traps with a frequency jump
We study the evolution of a trapped atomic cloud subject to a trapping
frequency jump for two cases: stationary and moving center of mass. In the
first case, the frequency jump initiates oscillations in the cloud's momentum
and size. At certain times we find the temperature is significantly reduced.
When the oscillation amplitude becomes large enough, local density increases
induced by the anharmonicity of the trapping potential are observed. In the
second case, the oscillations are coupled to the center of mass motion through
the anharmonicity of the potential. This induces oscillations with even larger
amplitudes, enhancing the temperature reduction effects and leading to
nonisotropic expansion rates while expanding freely.Comment: 8 figures, Journal of Physics B: At. Mol. Op. Phy
Nonlinear delocalization on disordered Stark ladder
05.45.-a Nonlinear dynamics and chaos, 63.50.-x Vibrational states in disordered systems, 03.75.Kk Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow,