Magneto-optics in pure and defective Ga1-x Mnx As from first principles

S. Picozzi, A. Continenza, M. Kim, Arthur J Freeman

Research output: Contribution to journalArticle

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Abstract

The magneto-optical properties of Ga1-x Mnx As including their most common defects were investigated with precise first-principles density-functional full-potential linearized augmented plane wave calculations in order to: (i) elucidate the origin of the features in the Kerr spectra in terms of the underlying electronic structure; (ii) perform an accurate comparison with experiments; and (iii) understand the role of the Mn concentration and occupied sites in shaping the spectra. In the substitutional case, our results show that most of the features have an interband origin and are only slightly affected by Drude-type contributions, even at low photon energies. While not strongly affected by the Mn concentration for the intermediately diluted range (x∼10%), the Kerr factor shows a marked minimum (up to 1.5°) occurring at a photon energy of ∼0.5 eV. For interstitial Mn, the calculated results bear a striking resemblance to the experimental spectra, pointing to the comparison between simulated and experimental Kerr angles as a valid tool to distinguish different defects in the diluted magnetic semiconductors framework.

Original languageEnglish
Article number235207
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number23
DOIs
Publication statusPublished - 2006

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Magnetooptical effects
magneto-optics
Photons
Defects
Electronic structure
Optical properties
defects
photons
bears
interstitials
plane waves
electronic structure
optical properties
energy
Experiments
Diluted magnetic semiconductors

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Magneto-optics in pure and defective Ga1-x Mnx As from first principles. / Picozzi, S.; Continenza, A.; Kim, M.; Freeman, Arthur J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 73, No. 23, 235207, 2006.

Research output: Contribution to journalArticle

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