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A: Fachverband Atomphysik

A 40: Ultracold Atoms and Molecules (with Q)

A 40.3: Vortrag

Freitag, 27. März 2015, 11:30–11:45, B/SR

Dicke super-radiance as non-destructive probe for super-fluidity in optical lattices — •Nicolai ten Brinke and Ralf Schützhold — Fakultät für Physik, Universität Duisburg-Essen, Lotharstraße 1, D-47057 Duisburg, Germany

We study Dicke super-radiance as collective and coherent absorption and emission of photons from an ensemble of ultra-cold atoms in an optical lattice. Since this process depends on the coherence properties of the atoms (e.g., super-fluidity), it can be used as a probe for their quantum state. This detection method is less invasive than time-of-flight experiments or direct (projective) measurements of the atom number (or parity) per lattice site, which both destroy properties of the quantum state such as phase coherence.

With our method, we are able to distinguish a partially excited (e.g., thermal) gas of atoms from a fully condensed (super-fluid) state. Regarding a phase transition from the Mott state to the super-fluid phase, it is possible to discriminate an adiabatic passage from a sudden transition. In this talk, we also discuss options for an experimental realization.