J. Heinze, J. S. Krauser, N. Fläschner, B. Hundt, S. Götze, K. Sengstock, C. Becker
We report on the first experimental observation of a persistent alternating photocurrent in an ultracold gas of fermionic atoms in an optical lattice. The dynamics is induced and sustained by an external harmonic confinement. We find a counterintuitively momentum-dependent oscillation frequency for excited particles and a fast decay of holes which we attribute to spatial trapping. Lifetime measurements reveal a significant enhancement of particle-hole recombination with increasing interactions.
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http://arxiv.org/abs/1208.4020
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