Metastable states of ultracold atoms

We discuss the dynamics of ultracold atoms in an optical potential accelerated by gravity. The positions and widths of the Wannier-Stark ladder of resonances are obtained as metastable states. The metastable Wannier-Bloch states oscillate in a single band with the Bloch period. The width of the resonance gives the rate transition to the continuum.

arXiv:cond-mat/0009185Physical Review AJan 12, 20019 citations

Metastable states of ultracold atoms

Published Jan 1, 2011• 0 citations

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A double-slit interference of ultracold neon atoms in the 1

{\mathit{s}}_{3}

metastable state is studied. The interferometer is aligned vertically, and because of gravity acceleration the atom changes its velocity as much as 2 m/s during the passage of the interference. The interference fringes are observed for the initial atomic velocity between 0 and 2 m/s.

The line shape of laser-induced ionizing collisions of ultracold Kr gas is investigated near the

{1s}_{5}[4p^{5}5s:^{3}P_{2}]

and

{2p}_{9}[4p^{5}5p:^{3}D_{3}]

transition. The rate increases several times when the laser is red tuned by a few times of the natural width, while it sharply decreases for a slight blue detuning. This frequency dependence of the collision rate is due to the collision dynamics characteristic of ultracold atoms in a near-resonant light. Our experimental results on metastable Kr atoms show a good qualitative agreement with semiclassical Monte Carlo simulation of the cold collision dynamics.