Semiconductors and dielectrics

Effect of a magnetic field on energy transfer of band states to the Mn$^{2+}$ 3$d$ shell in the CdMgTe matrix with ultrathin CdMnTe layers

V. F. Agekyan^a, P. O. Holtz^b, G. Karczewski^c, E. S. Moskalenko^d, A. Yu. Serov^a, N. G. Filosofov<sup>a

a</sup> V. A. Fock Institute of Physics, Saint-Petersburg State University
^b IFM Material Physics, Linköping University, Linköping, Sweden
^c Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
^d Ioffe Institute, St. Petersburg

Abstract: The effect of external magnetic fields on two radiative (band-to-band and on-site) recombination channels in II–VI dilute magnetic semiconductors and related nanostructures has been considered. The 3$d$ on-site emission of manganese ions in CdMgTe matrices containing periodic inclusions of CdMnTe narrow-band-gap layers with thicknesses of 0.5, 1.5, and 3.0 monolayers has been investigated in magnetic fields of up to 6 T. It has been shown that, in a magnetic field, luminescence of manganese ions weakens because of the decrease in the rate of spin-dependent excitation transfer from band states to the Mn$^{2+}$ 3$d$ shell. The maximum suppression of 3$d$ luminescence has been observed in the matrix with a CdMnTe layer 3.0 monolayers thick. This indicates that the main factor responsible for the energy transfer is the internal field near the CdMnTe layers, which determines the magnetic splitting and spin polarization of band states.

Received: 28.04.2009

 English version: Physics of the Solid State, 2010, 52:1, 27–31

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