195 research outputs found
Rapid non-adiabatic loading in an optical lattice
We present a scheme for non-adiabatically loading a Bose-Einstein condensate
into the ground state of a one dimensional optical lattice within a few tens of
microseconds typically, i.e. in less than half the Talbot period. This
technique of coherent control is based on sequences of pulsed perturbations and
experimental results demonstrate its feasibility and effectiveness. As the
loading process is much shorter than the traditional adiabatic loading
timescale, this method may find many applications.Comment: 5 pages, 4 figure
Mode competition in superradiant scattering of matter waves
Superradiant Rayleigh scattering in a Bose gas released from an optical
lattice is analyzed with incident light pumping at the Bragg angle for resonant
light diffraction. We show competition between superradiance scattering into
the Bragg mode and into end-fire modes clearly leads to suppression of the
latter at even relatively low lattice depths. A quantum light-matter
interaction model is proposed for qualitatively explaining this result.Comment: 6 pages, 6 figures, accepted by PR
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