Emerging dissipative phases in a superradiant quantum gas with tunable decay

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2021
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Ferri, Francesco
Rosa-Medina, Rodrigo
Finger, Fabian
Dogra, Nishant
Soriente, Matteo
Donner, Tobias
Esslinger, Tilman
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Physical Review X ; 11 (2021), 4. - 041046. - American Physical Society (APS). - eISSN 2160-3308
Abstract
Exposing a many-body system to external drives and losses can transform the nature of its phases and opens perspectives for engineering new properties of matter. How such characteristics are related to the underlying microscopic processes of the driven and dissipative system is a fundamental question. Here we address this point in a quantum gas that is strongly coupled to a lossy optical cavity mode using two independent Raman drives, which act on the spin and motional degrees of freedom of the atoms. This setting allows us to control the competition between coherent dynamics and dissipation by adjusting the imbalance between the drives. For strong enough coupling, the transition to a superradiant phase occurs, as is the case for a closed system. Yet, by imbalancing the drives we can enter a dissipation-stabilized normal phase and a region of multistability. Measuring the properties of excitations on top of the out-of-equilibrium phases reveals the microscopic elementary processes in the open system. Our findings provide prospects for studying squeezing in non-Hermitian systems, quantum jumps in superradiance, and dynamical spin-orbit coupling in a dissipative setting.
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ISO 690FERRI, Francesco, Rodrigo ROSA-MEDINA, Fabian FINGER, Nishant DOGRA, Matteo SORIENTE, Oded ZILBERBERG, Tobias DONNER, Tilman ESSLINGER, 2021. Emerging dissipative phases in a superradiant quantum gas with tunable decay. In: Physical Review X. American Physical Society (APS). 11(4), 041046. eISSN 2160-3308. Available under: doi: 10.1103/PhysRevX.11.041046
BibTex
@article{Ferri2021-04-26T18:00:01ZEmerg-58453,
  year={2021},
  doi={10.1103/PhysRevX.11.041046},
  title={Emerging dissipative phases in a superradiant quantum gas with tunable decay},
  number={4},
  volume={11},
  journal={Physical Review X},
  author={Ferri, Francesco and Rosa-Medina, Rodrigo and Finger, Fabian and Dogra, Nishant and Soriente, Matteo and Zilberberg, Oded and Donner, Tobias and Esslinger, Tilman},
  note={Article Number: 041046}
}
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