Theory of Effective g-Factors in Pb1-x-yMnxSnySe:
Effect of s(p)-d Hybridization
R L Hota
Department of physics, Rajiv Gandhi University of Knowledge Technologies
AP IIIT, Nuzvid – 521 202, Andhra Pradesh, India
e-mail: rlhota@yahoo.com
We have calculated and made a systematic analysis of the effective g-factors in
Pb1-x-yMnxSnySe using a theory for the quantity derived earlier [1]. The theory starts
from an one electron Hamiltonian in a periodic potential, spin orbit interaction,
uniform external magnetic field and the s(p)-d hybridization exchange interactions
due to magnetic impurities. We consider a six-band model [2], which includes, apart
from the band-edge levels, two additional levels both above and below the band
gap. The band edge states are treated exactly and the effect of far bands is
considered through the second-order perturbation theory. It is found that the
exchange interaction between the carriers and the localized magnetic impurities
contributes significantly to the effective g-factor. There is considerable anisotropy,
which is due primarily to the effect of the spin-orbit interaction. The calculated
results and trends are in overall agreement with experimental results where
available.
Key Words: Diluted magnetic semiconductors, s(p)-d Hybridization, g-factors
References:
[1]. R. L. Hota, G. S. Tripathi and J. N. Mohanty, Phys. Rev. B. 47 (1993) pp 9319- 9327.
[2]. K. Dash and G. S. Tripathi, Semicond. Sci Technol, 24 (2009) pp 015016-015023