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Q: Fachverband Quantenoptik und Photonik

Q 52: Quantum Gases (Bosons) V

Q 52.3: Vortrag

Donnerstag, 14. März 2019, 14:30–14:45, S HS 037 Informatik

Photon scattering in the dark -- atomic self-organization in optical cavities with repulsive potentials — •Philip Zupancic, Xiangliang Li, Alexander Baumgärtner, Andrea Morales, Davide Dreon, Tilman Esslinger, and Tobias Donner — ETH Zurich, Institute for Quantum Electronics

Atomic self-organization in optical cavities has been demonstrated to occur when atoms are illuminated with a standing-wave pump beam that is red-detuned with respect to an atomic transition. The atoms order into a pattern that maximizes their scattering amplitude into the cavity mode. Can the same happen for a blue-detuned (i.e. repulsive) pump in which the atoms are confined to the field nodes that should suppress their scattering rate?

We experimentally demonstrate self-organization for repulsive standing-wave pumps and explain the physical mechanism. We observe two distinct self-ordered phases that we can tune to compete with each other, and fast time dynamics linked to the dynamic dispersive shift. One of the ordered phases shows a finite extent in the parameter space of pump power and detuning arising from competing energy scales.