Optically induced energy and spin transfer in nonresonantly coupled pairs of self-assembled CdTe/ZnTe quantum dots

T. Kazimierczuk, J. Suffczyński, A. Golnik, J. A. Gaj, P. Kossacki, and P. Wojnar
Phys. Rev. B 79, 153301 – Published 2 April 2009

Abstract

Asymmetrical horizontal interdot coupling was demonstrated to exist in a system of a single plane of self-assembled CdTe/ZnTe quantum dots. Photoluminescence excitation (PLE), second-order photon correlation, and optical orientation were used as main experimental tools. Each individual absorbing dot was identified by a sharp PLE resonance assigned to the neutral exciton transition, while the corresponding emission contained several excitonic transitions of different charge states in another single quantum dot different from the absorbing one. Energy and spin transfer dynamics were studied. A high efficiency of spin transfer was found from the optical orientation in a vertical magnetic field (70%) as well as without the magnetic field (40%), in spite of a significant anisotropic exchange splitting of the absorbing dot. Coherent mechanism of linear-to-circular polarization conversion was identified, with an efficiency (43%) close to the theoretical limit of 50%.

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  • Received 7 November 2008

DOI:https://doi.org/10.1103/PhysRevB.79.153301

©2009 American Physical Society

Authors & Affiliations

T. Kazimierczuk*, J. Suffczyński, A. Golnik, J. A. Gaj, and P. Kossacki

  • Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

P. Wojnar

  • Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/64, 02-688 Warsaw, Poland

  • *Tomasz.Kazimierczuk@fuw.edu.pl

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Vol. 79, Iss. 15 — 15 April 2009

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