Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Quantum Gases (Bosons) III
Q 13.1: Talk
Tuesday, March 15, 2022, 10:30–10:45, Q-H10
Emerging Dissipative Phases in a Superradiant Quantum Gas with Tunable Decay — Francesco Ferri1, Rodrigo Rosa-Medina1, •Fabian Finger1, Nishant Dogra1, Matteo Soriente2, Oded Zilberberg2, Tobias Donner1, and Tilman Esslinger1 — 1Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland — 2Institute for Theoretical Physics, ETH Zürich, 8093 Zürich, Switzerland
Dissipative and coherent processes are at the core of the evolution of many-body systems. Their competition and interplay can lead to new phases of matter, instabilities, and complex non-equilibrium dynamics. However, probing these phenomena at a microscopic level in a setting of well-defined, controllable coherent and dissipative couplings often proves challenging. We realize such a system using a 87Rb spinor Bose-Einstein condensate (BEC) strongly coupled to a single optical mode of a lossy cavity [1]. Two transverse laser fields incident on the BEC allow for cavity-assisted Raman transitions between different motional states of two neighboring spin levels. Adjusting the drive imbalance controls coherent dynamics and dissipation, with the appearance of a dissipation-stabilized phase and bistability. We relate the observed phases to microscopic elementary processes in the open system by characterizing the properties of the underlying polariton modes. Our findings provide prospects for studying squeezing in non-Hermitian systems, quantum jumps in superradiance, and spin-orbit coupling in a dissipative setting.
[1] F. Ferri, et al., Phys. Rev. X 11, 041046 (2021).