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Published on: May 9, 2021
Steady state oscillations of circular currents in concentric polariton condensates
Vladimir Lukoshkin1,2, Evgeny Sedov3,4,5, Vladimir Kalevich1,2
1Ioffe Institute,Russian Academy of Sciences, 26 Politechnicheskaya, St-Petersburg, Russia, 194021.
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.
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