Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie

Q 57.33: Poster

Donnerstag, 17. März 2011, 16:30–19:30, P1

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

We study Bloch oscillations of ultracold 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 tunneling coupling, and the static field, the system displays chaotic level statistics. In this regime, the Bloch oscillations exhibit an irreversible and fast decay. We show that the corresponding decay rate can be obtained from the spectral properties of the Hamiltonian by investigating the weighted distribution of frequencies appearing in the local density of states.