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VOLUME 84 | ISSUE 8 | PAGE 514
Exciton states in strongly coupled asymmetric semimagnetic double quantum dots
S. V. Zaitsev, M. K. Welsch+, A. Forchel+, G. Bacher*
Institute of Solid State Physics RAS, 142432 Chernogolovka, Moscov reg., Russia
+Technische Physik, Universität Würzburg, D-97074 Würzburg, Germany
*Lehrstuhl Werkstoffe der Elektrotechnik, Universität Duisburg-Essen, D-47057 Duisburg, Germany


PACS: 73.21.La, 75.50.Pp, 75.75.+a
Abstract
Exciton states in a pair of strongly coupled artificial asymmetric quantum dots (QDs) have been studied in magnetic field up to B=8 T by means of photoluminescence spectroscopy. The QD molecules have been fabricated by a selective interdiffusion technique applied to asymmetric CdTe/(Cd,Mg,Mn)Te double quantum wells. The lateral confinement potential within the plane, induced by the diffusion, gives rise to effective zero-dimensional exciton localization. Incorporation of the Mn ions in only one dot results in a pair of QDs with a markedly different spin splitting. In contrast to a positive value of the exciton Lande g-factor in nonmagnetic (Cd,Mg)Te-based single QDs, the ground exciton transition in the nonmagnetic QD demonstrates nearly zero g-factor, indicating a strong electron coupling between the dots. New low-energy band with a strong red shift appears at high B signifying formation of the indirect exciton, in accordance with our calculations.


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