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A: Fachverband Atomphysik
A 13: Poster II
A 13.2: Poster
Dienstag, 15. März 2011, 18:00–20:00, P1
Collapse and Revival and Trap-induced Dynamics in Bosonic Lattice Systems — •Michael Buchhold1, Ulf Bissbort1, Sebastian Will2,3, and Walter Hofstetter1 — 1Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60438 Frankfurt/Main — 2Fakultät für Physik, Ludwig-Maximilians-Universität, 80799 München — 3Max-Planck-Institut für Quantenoptik, 85748 Garching
The recently achieved long-time observation of collapse and revival dynamics of a Bose-Einstein condensate loaded into a three-dimensional optical lattice allows to directly reveal the presence of effective coherent multi-particle interactions, generated via transitions to higher lattice orbitals.
To theoretically describe the collapse and revival dynamics of a BEC in an inhomogenous optical lattice, an effective single-band Hamiltonian in the Gutzwiller approximation is used, which includes transitions to higher bands by the use of renormalized parameters.
We study the interplay between quantum dynamics induced by the presence of a confining trap potential and the collapse and revival dynamics. We demonstrate that, with high accuracy, the dynamics in a ramped-up lattice can be described within a single particle picture, although inter-site tunneling is almost completely suppressed.