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We study analytically the optical properties of a simple model for anelectron-hole pair on a ring subjected to perpendicular magnetic flux andin-plane electric field. We show how to tune this excitonic system fromoptically active to optically dark as a function of these external fields. Ourresults offer a simple mechanism for exciton storage and read-out.

Exciton storage in a nano-scale Aharonov-Bohm ring with electric field tuning