Observation of \sigma-\pi coupling and mode selection in optically trapped artificial polariton molecules

Abstract

Microcavity exciton-polariton condensates under additional transverse confinement constitute a flexible optical platform to study the coupling mechanism between confined nonequilibrium and nonlinear states of matter. Driven far from equilibrium, polariton condensates can display spontaneous synchronization and instabilities depending on excitation and material parameters, showcasing emergent and intricate interference patterns based on mode competition over mutual gain landscapes. Here, we explore this coupling mechanism between polariton condensates populating the first excited ${\it p}$-state manifold of coupled optically trapped condensates and show a rich structure of patterns based on excitation parameters. The optical reconfigurability of the laser excitation patterns enables the creation of an annular-shaped beam to confine polaritons in a tailored trapping potential, whilst the dissipative nature of the optical traps enables effective interaction with neighboring condensates. Our results underpin the potential role of polariton condensates in exploring and simulating $\sigma$ and $\pi$ molecular bonding mechanisms between artificial two-dimensional diatomic orbitals and beyond.