Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Gases: Bosons III

Q 20.2: Vortrag

Dienstag, 24. März 2015, 11:15–11:30, P/H2

Strong field-induced multiphoton processes in driven lattices — •Malte Weinberg, Christoph Ölschläger, Simon Prelle, Klaus Sengstock, and Juliette Simonet — Institut für Laserphysik, Universität Hamburg

Periodic inertial forcing of ultracold quantum gases in optical lattices provides a powerful tool for the coherent manipulation of motional degrees of freedom in quantum many-body systems.

Here, we present systematic studies on the emergence of excitationsin these driven systems for various forcing strengths and lattice dimensionalities. We identify the observed resonances with multiphoton transitions between the two lowest energy bands in excellent agreement with ab initio calculations. The pure and well-controllable environment of atomic ensembles in driven optical lattices allows for the investigation of quantized high-order excitations which are hardly accessible in other physical systems.