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

Ł. Kłopotowski, Ł. Cywiński, M. Szymura, V. Voliotis, R. Grousson, P. Wojnar, K. Fronc, T. Kazimierczuk, A. Golnik, G. Karczewski, and T. Wojtowicz
Phys. Rev. B 87, 245316 – Published 28 June 2013

Abstract

We present a comprehensive experimental and theoretical study of photoluminescence of single Cd1xMnxTe 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.

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  • Received 9 April 2013

DOI:https://doi.org/10.1103/PhysRevB.87.245316

©2013 American Physical Society

Authors & Affiliations

Ł. Kłopotowski1,*, Ł. Cywiński1, M. Szymura1, V. Voliotis2, R. Grousson2, P. Wojnar1, K. Fronc1, T. Kazimierczuk3, A. Golnik3, G. Karczewski1, and T. Wojtowicz1

  • 1Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
  • 2Institut des NanoSciences de Paris, Université Pierre et Marie Curie, CNRS, 4 place Jussieu, 75252 Paris, France
  • 3Faculty of Physics, University of Warsaw, ul. Hoża 69, 00-681 Warsaw, Poland

  • *Corresponding author: lukasz.klopotowski@ifpan.edu.pl

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Vol. 87, Iss. 24 — 15 June 2013

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