Influence of exciton spin relaxation on the photoluminescence spectra of semimagnetic quantum dots

We present a comprehensive experimental and theoretical study of photoluminescence of single Cd sub(1-x) Mnx Te quantum dots with Mn content x ranging from 0.01 to 0.2. We distinguish three stages of the equilibration of the exciton-Mn ion spin system and show that the intermediate stage, in which t...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-06, Vol.87 (24), Article 245316
Main Authors: Kłopotowski, Ł., Cywiński, Ł., Szymura, M., Voliotis, V., Grousson, R., Wojnar, P., Fronc, K., Kazimierczuk, T., Golnik, A., Karczewski, G., Wojtowicz, T.
Format: Article
Language:English
Subjects:
Asymmetry
Condensed Matter
Excitation spectra
Manganese
Mathematical analysis
Photoluminescence
Physics
Quantum dots
Spectra
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Summary:We present a comprehensive experimental and theoretical study of photoluminescence of single Cd sub(1-x) Mnx Te quantum dots with Mn content x ranging from 0.01 to 0.2. We distinguish three stages of the equilibration of the exciton-Mn ion spin system and show that the intermediate stage, in which the exciton spin is relaxed while the total equilibrium is not attained, gives rise to a specific asymmetric shape of the photoluminescence spectrum. From an excellent agreement between the measured and calculated spectra we are able to evaluate the exciton localization volume, number of paramagnetic Mn ions, and their temperature for each particular dot. We discuss the values of these parameters and compare them with results of other experiments. Furthermore, we analyze the dependence of average Zeeman shifts and transition linewidths on the Mn content and point out specific processes, which control these values at particular Mn concentrations.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.87.245316