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Abstract : New systems of quantum dot with single magnetic ion

P. Kossacki, T. Smoleński, J. Kobak, M. Goryca, M. Papaj, K. Gietka, A. Bogucki,
M. Koperski, J.-G. Rousset, J. Suffczyński, E. Janik, M. Nawrocki, A. Golnik, W. Pacuski

 

Institute of Experimental Physics, Faculty of Physics, University of Warsaw,
ul. Hoża 69, 00-681 Warsaw, Poland

 

In this work we will present spectroscopic studies of new systems of quantum dots with single magnetic ions. We will report on the first optical observation of individual cobalt ion in a CdTe/ZnTe quantum dot and individual manganese ion in a CdSe/ZnSe dot [1]. Observed phenomena are compared to magneto-photoluminescence results obtained for diluted magnetic semiconductors (DMS) based on cobalt : (Cd,Co)Te, (Zn,Co)Te [2], (Zn,Co)O [3], for wide gap DMS based on manganese, such as (Zn,Mn)O [4], and for CdTe quantum dots with single Mn ions.

The most surprising findings are related to exciton recombination channels. For DMS structures where exciton energy is larger than intraionc transition energy, we observe excitonic photoluminescence which is weak due to quenching by magnetic ions. However, for single magnetic ions in dots, effect of quenching is negligible. This is proved by exciton photoluminescence decay measurements which show no difference in decay time of nonmagnetic dots and dots with single magnetic ions [1].

We will present also magnetooptical measurements of the spin relaxation of the single magnetic ion. We will discuss various effects limiting its lifetime such as electronic configuration of magnetic ion, local strain, nuclear spin, and spin orbit interaction.

 

 

[1] J. Kobak, T. Smoleński, M. Goryca, M. Papaj, K. Gietka, A. Bogucki, M. Koperski, J.-G. Rousset, J. Suffczyński, E. Janik, M. Nawrocki, A. Golnik, P. Kossacki, W. Pacuski, Nature Communcations 5, 3191 (2014).

[2] M. Papaj, J. Kobak, J.G. Rousset, E. Janik, M. Nawrocki, P. Kossacki, A. Golnik, W. Pacuski, Journal of Crystal Growth 401, 644 (2014).

[3] Pacuski, D. Ferrand, J. Cibert, C. Deparis, J. A. Gaj, P. Kossacki, C. Morhain, Phys. Rev. B 73, 035214 (2006).

[4] W. Pacuski, J. Suffczynski, P. Osewski, P. Kossacki, A. Golnik, J. A. Gaj, C. Deparis, C. Morhain, E. Chikoidze, Y. Dumont, D. Ferrand, J. Cibert, T. Dietl, Phys. Rev. B 84, 035214 (2011).