FORMATION OF SEMIMAGNETIC SEMICONDUCTOR SUPERLATTICES BY IONIZED CLUSTER-BEAM TECHNIQUE AND THEIR QUANTUM-SIZE EFFECTS

Autor: Tsuyoshi Koyanagi, H. Ohmoto, H. Anno, K. Matsubara
Rok vydání: 1996
Předmět:
Zdroj: Surface Review and Letters. :1033-1038
ISSN: 1793-6667
0218-625X
DOI: 10.1142/s0218625x96001856
Popis: The formation of semimagnetic semiconductor Cd1−xMnxTe superlattices on GaAs (100) and sapphire (0001) substrates by the ionized cluster-beam (ICB) deposition technique and their quantum-size effects on the optical and magneto-optical properties are reported. The observation of high-order satellite x-ray diffraction and the Raman scattering from folded longitudinal acoustic (LA) phonons suggests that the Cd 1−x Mn x Te superlattices have a satisfactory periodic structure. Transitions to the subband levels formed in the wells of superlattices are observed in the optical absorption spectra and the magneto-circular dichroism (MCD) spectra. The transition energies shift widely toward higher energies as the well width is decreased. The experimental results for subband energies agree well with the results calculated using the Kronig-Penney band model. The change in MCD peak height with the well width can be explained in terms of the Zeeman splitting of the subband levels and the oscillator strengths of transitions to those levels.
Databáze: OpenAIRE