Controlled ordering of topological charges in an exciton-polariton chain
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We demonstrate, experimentally and theoretically, controlled loading of an exciton-polariton vortex chain into a 1D array of trapping potentials. Switching between two types of vortex chains, with topological charges of the same or alternating sign, is achieved by appropriately shaping an off-resonant pump beam that drives the system to the regime of bosonic condensation. In analogy to spin chains, these vortex sequences realise either a "ferromagnetic" or an "anti-ferromagnetic" order, whereby the role of spin is played by the orbital angular momentum. The ferromagnetic ordering of vortices is associated with the formation of a persistent chiral current. Our results pave the way for the controlled creation of nontrivial distributions of orbital angular momentum and topological order in a periodic exciton-polariton system.
Gao , T , Egorov , O A , Estrecho , E , Winkler , K , Kamp , M , Scheider , C , Höfling , S , Truscott , A G & Ostrovskaya , E A 2018 , ' Controlled ordering of topological charges in an exciton-polariton chain ' , Physical Review Letters , vol. 121 , no. 22 , 225302 . https://doi.org/10.1103/PhysRevLett.121.225302
Physical Review Letters
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