Collective Excitations of a Strongly Correlated Nonequilibrium Photon Fluid across the Insulator-Superfluid Phase Transition
Year: 2023
Authors: Caleffi F., Capone M., Carusotto I.
Autors Affiliation: Int Sch Adv Studies SISSA, Via Bonomea 265, I-34136 Trieste, Italy; CNR IOM Democritos, Via Bonomea 265, I-34136 Trieste, Italy; Univ Trento, INO CNR BEC Ctr, Via Sommarive 14, I-38050 Trento, Italy; Univ Trento, Dipartimento Fis, Via Sommarive 14, I-38123 Povo, Italy.
Abstract: We develop a Gutzwiller theory for the nonequilibrium steady states of a strongly interacting photon fluid driven by a non-Markovian incoherent pump. In particular, we explore the collective modes of the system across the out-of-equilibrium insulator-superfluid transition of the system, characterizing the diffusive Goldstone mode in the superfluid phase and the excitation of particles and holes in the insulating one. Observable features in the pump-and-probe optical response of the system are highlighted. Our predictions are experimentally accessible to state-of-the-art circuit-QED devices and open the way for the study of novel driven-dissipative many-body scenarios with no counterparts at equilibrium.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 131 (19) Pages from: 193604-1 to: 193604-7
More Information: Stimulating discussions with M. Schiro, A. Biella, M. Secli, and M. Stefanini are warmly acknowledged. F. C. and M. C. acknowledge financial support from the Italian MIUR under the PRIN 2017 CEnTraL project (Prot. 20172H2SC4 005) and PRIN 2020 (Prot. 2020JLZ52N 002) . I. C. acknowledges financial support from the European Union H2020-FETFLAG-2018-2020 project PhoQuS (n.820392) , from the Provincia Autonoma di Trento, from the Q@TN Initiative, and from the PNRR MUR project PE0000023-NQSTI.KeyWords: Interacting Photons; Quantum; Polaritons; Localization; SignaturesDOI: 10.1103/PhysRevLett.131.193604Connecting to view paper tab on IsiWeb: Click here