Controllable structuring of exciton-polariton condensates in cylindrical pillar microcavities

We observe condensation of exciton polaritons in quantum states composed of concentric rings when exciting cylindrical pillar GaAs/AlGaAs microcavities non-resonantly by a focused laser beam normally incident at the center of the pillar. The number of rings depends on the pumping intensity and the p...

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Published inarXiv.org
Main Authors Kalevich, V K, Afanasiev, M M, Lukoshkin, V A, Solnyshkov, D D, Malpuech, G, Kavokin, K V, Tsintzos, S I, Hatzopoulos, Z, Savvidis, P G, Kavokin, A V
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.11.2014
Subjects
Condensation
Excitation
Excitons
Laser beams
Lobes
Microcavities
Physics - Mesoscale and Nanoscale Physics
Polaritons
Position (location)
Quantum numbers
Quantum theory
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Summary:We observe condensation of exciton polaritons in quantum states composed of concentric rings when exciting cylindrical pillar GaAs/AlGaAs microcavities non-resonantly by a focused laser beam normally incident at the center of the pillar. The number of rings depends on the pumping intensity and the pillar size, and may achieve 5 in the pillar of 40 mkm diameter. Breaking the axial symmetry when moving the excitation spot away from the pillar center leads to transformation of the rings into a number of bright lobes corresponding to quantum states with nonzero angular momenta. The number of lobes, their shape and location are dependent on the spot position. We describe the out-of-equilibrium condensation of polaritons in the states with different principal quantum numbers and angular momenta with a formalism based on Boltzmann-Gross-Pitaevskii equations accounting for repulsion of polaritons from the exciton reservoir formed at the excitation spot and their spatial confinement by the pillar boundary.
ISSN:2331-8422
DOI:10.48550/arxiv.1411.3222