Controlled Ordering of Topological Charges in an Exciton-Polariton Chain.
Phys Rev Lett
; 121(22): 225302, 2018 Nov 30.
Article
em En
| MEDLINE
| ID: mdl-30547627
ABSTRACT
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 signs, 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 realize either a "ferromagnetic" or an "antiferromagnetic" 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.
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MEDLINE
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En
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2018
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Article