Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 26: Ultra-cold atoms (joint session A/Q)

Q 26.6: Talk

Wednesday, March 13, 2019, 11:45–12:00, S HS 1 Physik

Light-Induced Coherence in an Atom-Cavity System — •Christoph Georges and Andreas Hemmerich — Institut für Laser-Physik, Universität Hamburg

We demonstrate a light-induced formation of coherence in a cold atomic gas system that utilizes the suppression of a competing density wave (DW) order. The condensed atoms are placed in an optical cavity and pumped by an external optical standing wave, which induces a long-range interaction mediated by photon scattering and a resulting DW order above a critical pump strength. We show that the light-induced temporal modulation of the pump wave can suppress this DW order and restore coherence. This establishes a foundational principle of dynamical control of competing orders analogous to a hypothesized mechanism for light-induced superconductivity in high-Tc cuprates.