Raman scattering by magnetic excitations and phonons in diluted magnetic structures formed by self-organized quantum disks of CdZn(Mn)Se in a Zn(Mn)Se matrix - art. no. 035303

摘要

Photoluminescence and resonant Raman scattering by magnetic excitations and optical phonons were studied in diluted magnetic structures that consisted of nominally two monolayer depositions of CdSe between ZnSe barriers. Mn was incorporated either into the CdSe layers or into the barriers. self-organized quantum islands of composition CdZnSe are formed in the "well" layers during growth. Luminescence bands of excitons localized at the islands showed under applied magnetic fields strong effects of s,p-d exchange interaction of band carriers with Mn2+ ions. Different types of magnetic excitation were observed in resonant Raman scattering spectra, such as spin-flip scattering of the donor-bound magnetic polarons at the CdZnSe islands, Raman transitions between ground and first excited states of antiferromagnetically coupled nearest neighbor Mn2+ ions, and collective multiple spin-flip Raman scattering within a Zeeman split Mn2+ ground state. The Raman spectra of optical phonons were studied under resonance and off-resonance excitation. [References: 27]