Disorder-Induced Effects in III-V Semiconductors with Mn

• Authors: J. Mašek , F. Máca
• Languages of publication: EN

Abstracts

EN

The substitution of Mn in the III-V diluted magnetic semiconductors leads to a strong electron scattering on impurities. Besides the features induced in the valence band by the hybridization with the Mn d-states, also the conduction band is affected by the absence of the Mn s-states at its edge. Also the high concentration of compensating donors modifies the band structure. This is shown on the absorption coefficientε_2(ω) of GaP doped with Mn and Se. The absorption evaluated by ab initio density functional calculations starts with a smooth tail and does not show the structure typical of III-V materials. We analyze these features and the role of the donors on model systems using the tight-binding coherent potential approach.

Keywords

EN

71.15.Ap; 71.20.Nr; 71.55.Eq; 75.50.Pp

Discipline

• 71.15.Ap: Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)
• 71.55.Eq: III-V semiconductors
• 75.50.Pp: Magnetic semiconductors
• 71.20.Nr: Semiconductor compounds

• Journal: Acta Physica Polonica A
• Year: 2002
• Volume: 102
• Issue: 4-5
• Pages: 667-672

Dates

published

2002-10/11

received

2002-06-07

Contributors

author

J. Mašek

• Institute of Physics, AS CR, Na Slovance 2, 182 21 Prague 8, Czech Republic

author

F. Máca

• Institute of Physics, AS CR, Na Slovance 2, 182 21 Prague 8, Czech Republic

References

• 1. J.K. Furdyna, J. Appl. Phys., 64, R 29, 1988
• 2. H. Ohno, J. Magn. Magn. Mater., 200, 110, 1999
• 3. F. Herman, S. Skillman, Atomic Structure Calculations, Prentice-Hall, New Jersey 1963
• 4. B.E. Larson, K.C. Hass, H. Ehrenreich, A.E. Carlsson, Phys. Rev. B, 37, 4137, 1988
• 5. J. Masek, F. Maca, Acta Phys. Pol. A, 100, 319, 2001
• 6. F. Maca, J. Masek, Phys. Rev. B, 65, 235209, 2002
• 7. W.E. Spicer, Phys. Rev., 154, 385, 1967
• 8. B. Beschoten, P.A. Crowell, I. Malajovich, D.D. Awschalom, F. Matsukura, A. Shen, H. Ohno, Phys. Rev. Lett., 83, 3073, 1999
• 9. P. Blaha, K. Schwarz, J. Luitz, WIEN97, FPLAPW package for calculating crystal properties, TU Vienna
• 10. F. Urbach, Phys. Rev., 92, 1324, 1953
• 11. B. Velicky, S. Kirkpatrick, H. Ehrenreich, Phys. Rev., 175, 747, 1968
• 12. J. Masek, B. Velicky, V. Janis, J. Phys. C, 20, 59, 1987
• 13. J.N. Talwar, C.S. Ting, Phys. Rev. B, 25, 2660, 1982

Identifiers

DOI

10.12693/APhysPolA.102.667