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Q: Quantenoptik

Q IV: HV IV

Q IV.1: Hauptvortrag

Mittwoch, 5. März 1997, 11:00–11:45, N 1

Quantum Transport of Ultra–Cold Atoms in Optical Lattices — •Mark Raizen — Department of Physics, The University of Texas at Austin, Austin, Texas 78712-1081

We study atomic motion in an accelerating periodic lattice. The potenial is formed by a chirped standing wave that is tuned far from atomic resonance, and our experiments concentrate on the regime of quantum transport. We observe Wannier-Stark ladders resonances in probe spectroscopy of the band structure. We also observe quantum tunneling, which is the ultimate loss mechanism for this atom accelerator leading to an exponential decay in the survival probability. We have recently utilized this system to observe short-time deviation from exponential decay, a fundamental quantum effect predicted for unstable systems.