Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 5: Ultra-Cold Atoms: Rydberg Gases / Miscellaneous (with Q)

A 5.7: Vortrag

Montag, 8. März 2010, 18:15–18:30, A 320

Spectral origin of decaying Bloch oscillations — •Hannah Venzl, Moritz Hiller, and Andreas Buchleitner — Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg

We study Bloch oscillations of ultra-cold bosonic atoms in tilted optical lattices. Our analysis is based on the Bose-Hubbard Hamiltonian amended by a static field term. For comparable values of the control parameters, namely the inter-atomic interaction, the inter-site hopping amplitude, and the static field, the system displays chaotic level statistics. In this regime, the Bloch oscillations exhibit an irreversible, fast decay. We discuss how the corresponding decay rate can be obtained from the spectral properties of the Bose-Hubbard Hamiltonian.