title: Optical spectra of CdMnSe of nano-ferro- and antiferro-magnets.
abstract: We study optical transitions in CdSe quantum dots doped by Mn atoms. At low concentrations the transitions are spin-forbidden. Nevertheless, strong light absorption was experimentally found. To explain this effect we propose a new mechanism that includes two or more Mn atoms closely placed to each other containing the electrons with opposite spin projections. In this case the spin-flip is unnecessary. In addition we study absorption from quantum dots containing two Mn atoms with different multiplicities. We find that the strongest absorption from the gap is for an antiferromagnetic arrangement. The obtained results confirm the experimental concentration dependencies.
authors.affiliation: Department of Physics and Astronomy/3905 1000 E, University Avenue, University of Wyoming, Laramie, WY 82071, USA. yurid@uwyo.edu.
authors.forename: Vitaly
authors.initials: V
authors.lastname: Proshchenko
authors.forename: Yuri
authors.initials: Y
authors.lastname: Dahnovsky
mesh_terms: D002104:Cadmium / Q000737:chemistry*; D058085:Iron Compounds / Q000737:chemistry*; D059346:Magnets / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D045663:Quantum Dots; D012643:Selenium / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D058085:Iron Compounds; D002104:Cadmium; D008345:Manganese; D012643:Selenium