Magneto photoluminescence in droplet epitaxial GaAs quantum rings

Making use of a novel droplet epitaxy technique. we realize GaAs ring shaped quantum dots of high circular symmetry. Here we report on photoluminescence (PL) study of single isolated quantum rings in magnetic field up to T. Polarized PL signals show a significant reduction in their intensity at >6 T. Possible origins accounting for this observation are discussed. (c) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim