Perspectives in superfluidity in resonantly driven polariton fluids

Anno: 2020

Autori: Amelio I., Carusotto I.

Affiliazione autori: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy.

Abstract: In this paper we discuss, within the Gross-Pitaevskii framework, superfluidity, soliton-like patterns, and instabilities in a nonequilibrium polariton fluid injected by a spatially localized and continuous-wave coherent pump and flowing against a defect located outside the pump spot. In contrast to equilibrium condensates of ultracold atoms or liquid helium, the steady-state solutions of the driven-dissipative equations in this specific geometry hardly show a clean superfluid flow around the defect and rather feature a crossover from shallow to deep soliton-like perturbation. This is explained in terms of the properties of one-dimensional flows, in particular their weak dependence on the pump parameters and their rapid transition to a supersonic regime under the effect of the quantum pressure. The role of disorder and of an incoherent reservoir in inducing nonstationary behaviors with moving phase singularities is also highlighted. Such complex and highly nonlinear behaviors call for quantitative experimental tests of the underlying Gross-Pitaevskii equation.

Giornale/Rivista: PHYSICAL REVIEW B

Volume: 101 (6)      Da Pagina: 64505-1  A: 64505-11

Maggiori informazioni: We are grateful to Simon Pigeon for useful discussions. We acknowledge financial support from the European Union FET-Open grant MIR-BOSE (No. 737017), from the H2020-FETFLAG-2018-2020 project PhoQuS (No. 820392), and from the Provincia Autonoma di Trento. All numerical calculations were performed using the Julia programming language [26].
Parole chiavi: Bose-Einstein condensation; Defects; Liquefied gases; Nonlinear equations; Phonons; Solitons; Superfluid helium; Dissipative equations; Gross-Pitaevskii equation; Non-stationary behaviors; Nonlinear behavior; Onedimensional flow; Phase singularities; Rapid transitions; Steady state solution
DOI: 10.1103/PhysRevB.101.064505

Citazioni: 14
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18
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