Excitation of localized condensates in the flat band of exciton-polariton Lieb lattice

TL;DR

This paper demonstrates a method to excite and analyze localized polariton condensates in a flat band Lieb lattice using short laser pulses, revealing dynamics influenced by interactions and losses.

Contribution

It introduces a direct excitation technique for compact localized condensates in a flat band Lieb lattice and studies their dynamic behavior under interactions and losses.

Findings

Fast Rabi oscillations observed at low densities

Oscillations suppressed at higher densities due to interactions

Incoherent pumping enhances condensate stability

Abstract

We propose a way to directly excite compact localized condensates in a nearly flat band of the exciton-polariton Lieb lattice by short Laguerre-Gaussian pulses and investigate the dynamics of these condensates in the presence of repulsive polariton-polariton interaction and distributed losses in the lattice. The evolution of a low-density compact polariton condensate shows fast Rabi oscillations between its excitonic and photonic components, with slow beatings of the Rabi oscillation amplitude. Both oscillations and beatings are suppressed at higher condensate densities due to polariton-polariton repulsion and distributed losses in the lattice. A background incoherent pumping can be used to increase the lifetime and stability of compact localized states