Optical studies of carrier and phonon dynamics in Ga_{1-x}Mn_{x}As

Details Optical studies of carrier and phonon dynamics in Ga_{1-x}Mn_{x}As Optical studies of carrier and phonon dynamics in Ga_{1-x}Mn_{x}As

2005-04-13

arxiv.org/abs/cond-mat/0504316v2

Physics

Condensed Matter

Materials Science

13 pages, 3 figures replaced Fig.1 after finding a mistake in previous version

Scientific paper

10.1063/1.2137889

We present a time-resolved optical study of the dynamics of carriers and phonons in Ga_{1-x}Mn_{x}As layers for a series of Mn and hole concentrations. While band filling is the dominant effect in transient optical absorption in low-temperature-grown (LT) GaAs, band gap renormalization effects become important with increasing Mn concentration in Ga_{1-x}Mn_{x}As, as inferred from the sign of the absorption change. We also report direct observation on lattice vibrations in Ga1-xMnxAs layers via reflective electro-optic sampling technique. The data show increasingly fast dephasing of LO phonon oscillations for samples with increasing Mn and hole concentration, which can be understood in term of phonon scattering by the holes.

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