Controlled Ordering of Topological Charges in an Exciton-Polariton Chain
Date
2018
Authors
Gao, Tingge
Egorov, Oleg A
Estrecho, Eliezer
Winkler, K
Kamp, Martin
Schneider, C
Höfling, S
Truscott, Andrew
Ostrovskaya, Elena
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American Physical Society
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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Physical Review Letters
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Journal article
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Open Access
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