 \documentstyle{article}
%\documentstyle[preprint,aps]{revtex}
\textheight 255 mm \textwidth 160 mm
\oddsidemargin 1 mm
\topmargin -05 mm
\headheight 6 mm \headsep 7mm
\footskip 0mm  \footheight 5mm
\baselineskip 4.5mm  \parskip 3mm  \parindent 10mm
\def\b{\bigskip}
\def\n{\noindent}
%\normalsize
%\Large
\begin{document}
\begin{center}
 {\Large \bf Transient excitation of \boldmath $d$ electrons}

\vspace{3mm}
 {\Large \bf  in dilute magnetic semiconductors}

\vspace{5mm}
\noindent
{\large \it
B. Velick\'{y}$\,^{\dagger}$
A. Kalvov\'{a}$\,^{\ddagger}$, V. \v Spi\v cka,}
\\[5mm]
Institute of Physics, Academy of Sciences of the Czech
Republic,\\ Na Slovance 2, CZ-180 40 Praha 8, Czech Republic
\vspace{5mm}

\begin{minipage}[t]{14cm} {\parskip 3mm  \parindent 10mm
We  model a dilute magnetic semiconductor  as a random alloy
in which some of the cationic sites in a zinc blende structure are
occupied by an Anderson impurity with the Coulomb interaction $U$ strong
enough to keep the $d$ state half occupied. In the spirit of the
DMFT (Dynamical mean field theory) for the localized interaction and the CPA
for the chemical disorder, the $d$-electron self-energy is taken as
site localized and determined from a self-consistent condition representing
the problem in terms of an effective Anderson defect.

This picture can be carried over also to  non-equilibrium, and we
develop a  NGF description of the local transients in the charge and magnetic
moment distribution created by ultrashort light pulses and reflecting
the dynamics of the local spins and the reaction of the surrounding $s$$p-$electrons
driven by hybridization and screening.

The NGF at early times can be obtained by a direct solution in the time domain,
and we report first results obtained in simplified limits, in particular
for the static spin fluctuations.


}
\end{minipage}
\end{center}

\b\b\b\n
$\,^{\dagger}$ {\tt kalvova@fzu.cz}\\
$\,^{\ddagger}$ Also: {\it Faculty of Mathematics and Physics, Charles University,
Prague}
\end{document}
