Steady state oscillations of circular currents in concentric polariton condensates
Abstract
Concentric ring exciton polariton condensates emerging under non-resonant laser pump in an annular trapping potential support persistent circular currents of polaritons. The trapping potential is formed by a cylindrical micropillar etched in a semiconductor microcavity with embedded quantum wells and a repulsive cloud of optically excited excitons under the pump spot. The symmetry of the potential is subject to external control via manipulation by its pump-induced component. In the manuscript, we demonstrate excitation of concentric ring polariton current states with predetermined vorticity which we trace using interferometry measurements with a spherical reference wave. We also observe the polariton condensate dynamically changing its vorticity during observation, which results in pairs of fork-like dislocations on the time-averaged interferogram coexisting with azimuthally homogeneous photoluminescence distribution in the micropillar.
Cite
@article{arxiv.2210.05306,
title = {Steady state oscillations of circular currents in concentric polariton condensates},
author = {Vladimir Lukoshkin and Evgeny Sedov and Vladimir Kalevich and Z. Hatzopoulos and P. G. Savvidis and Alexey Kavokin},
journal= {arXiv preprint arXiv:2210.05306},
year = {2024}
}