Transition from Propagating Polariton Solitons to a Standing Wave Condensate Induced by Interactions

Abstract

We explore nonlinear transitions of polariton wavepackets, first, to a soliton and then to a standing wave polariton condensate in a multi-mode microwire system. At low polariton density we observe ballistic propagation of the multi-mode polariton wavepackets arising from the interference between different transverse modes. With increasing polariton density, the wavepackets transform into single mode bright solitons due to effects of both inter-modal and intra-modal polariton-polariton scattering. Further increase of the excitation density increases thermalisation speed leading to relaxation of the polariton density distribution in momentum space with the resultant formation of a non-equilibrium condensate manifested by a standing wave pattern across the whole sample.

Wave condensation with weak disorder versus beam self-cleaning in multimode fibers

“…We recall that this self-organization process takes place in a conservative (Hamiltonian) and formally reversible system: The ('condensate') remains immersed in a sea of small-scale fluctuations ('uncondensed particles'), which store the information for time reversal. In this respect, wave condensation is of different nature than other forms of condensation processes discussed in optical cavity systems, which are inherently nonequilibrium forced-dissipative systems [20,[28][29][30][31][32][33][34][35][36].…”

Stationary Quantum Vortex Street in a Driven-Dissipative Quantum Fluid of Light

“…The solving time is determined by the velocity of the street's head, which corresponds to the propagation velocity of a domain wall v given by Eq. (20). In the worst case, the length of the dead end is N w, where N is the number of cells in the maze (or vertices in the graph) and w is the width of a corridor.…”

Femtosecond Dynamics of a Polariton Bosonic Cascade at Room Temperature

“…We visualize the femtosecond dynamics of stimulated transitions of excitonpolaritons between the condensates formed by whispering gallery modes of a ZnO microwire in the strong exciton-photon coupling regime. We argue that the ultrafast dynamics (34)(35)(36)(37)(38)(39)(40)(41) can truly reveal the physics of bosonic cascades that has not been fully understood till now. The real time evolution of polariton condensates is characterized by multiple degrees of freedom involving energy, space and momentum.…”