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A: Fachverband Atomphysik

A 12: Ultra-cold atoms, ions and BEC

A 12.30: Poster

Tuesday, March 12, 2019, 16:30–18:30, S Fobau Physik

Light-Induced Coherence in an Atom-Cavity System — •Christoph Georges, Jayson Cosme, Ludwig Mathey, 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 cav- ity 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.