Dynamical density wave order in an atom-cavity system

• URL: http://arxiv.org/abs/2003.14135v2
• Date: Tue, 26 Jan 2021 05:58:27 GMT
• Title: Dynamical density wave order in an atom-cavity system
• Authors: Christoph Georges, Jayson G. Cosme, Hans Ke{\ss}ler, Ludwig Mathey, Andreas Hemmerich
• Abstract summary: A Bose-Einstein condensate is placed inside a high finesse optical resonator and pumped sideways by an optical standing wave. The pump strength is chosen to induce a stationary superradiant density wave order of the atoms stabilized by a strong intracavity light field. We show theoretically that, when the pump is modulated with sufficient strength at a frequency $omega_>$, a dynamical density wave order emerges.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We theoretically and experimentally explore the emergence of a dynamical density wave order in a driven dissipative atom-cavity system. A Bose-Einstein condensate is placed inside a high finesse optical resonator and pumped sideways by an optical standing wave. The pump strength is chosen to induce a stationary superradiant checkerboard density wave order of the atoms stabilized by a strong intracavity light field. We show theoretically that, when the pump is modulated with sufficient strength at a frequency $\omega_{d}$ close to a systemic resonance frequency $\omega_{>}$, a dynamical density wave order emerges, which oscillates at the two frequencies $\omega_{>}$ and $\omega_{<} = \omega_{d} - \omega_{>}$. This order is associated with a characteristic momentum spectrum, also found in experiments in addition to remnants of the oscillatory dynamics presumably damped by on-site interaction and heating, not included in the calculations. The oscillating density grating, associated with this order, suppresses pump-induced light scattering into the cavity. Similar mechanisms might be conceivable in light-driven electronic matter.

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