Exciton states in strongly coupled asymmetric semimagnetic double quantum dots |
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Authors: | S V Zaitsev M K Welsch A Forchel G Bacher |
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Institution: | 1. Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia 2. Technische Physik, Universit?t Würzburg, D-97074, Würzburg, Germany 3. Lehrstuhl Werkstoffe der Elektrotechnik, Universit?t Duisburg-Essen, D-47057, Duisburg, Germany
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Abstract: | Exciton states in a pair of strongly coupled artificial asymmetric quantum dots (QDs) have been studied in magnetic fields
up to B = 8T by means of photoluminescence spectroscopy. The QD molecules have been fabricated using 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, thus, indicating a strong electron coupling between the dots. A new low-energy band with a strong red shift appears
at high B signifying formation of the indirect exciton in accordance with our calculations.
The text was submitted by the authors in English. |
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