\begin{slide}
{\large\bf
- C 100 interstitial migration along 110 in c-Si (Albe potential)\\
+ C 100 interstitial migration along 110 in c-Si (Albe potential)
}
{\color{blue}New approach:}\\
Place interstitial carbon atom at the respective coordinates
into a perfect c-Si matrix!\\
- {\color{red}Problem:}\\
+ {\color{blue}Problem:}\\
Too high forces due to the small distance of the C atom to the Si
atom sharing the lattice site.\\
- {\color{green}Solution:}
- Slightly displace the Si atom\\
+ {\color{blue}Solution:}
+ \begin{itemize}
+ \item {\color{red}Slightly displace the Si atom}
+ (Video \href{../video/c_in_si_pmig_albe.avi}{$\rhd_{\text{local}}$ } $|$
+ \href{http://www.physik.uni-augsburg.de/~zirkelfr/download/posic/c_in_si_pmig_albe.avi}{$\rhd_{\text{remote url}}$})
+ \item {\color{green}Immediately quench the system}
+ (Video \href{../video/c_in_si_pqmig_albe.avi}{$\rhd_{\text{local}}$ } $|$
+ \href{http://www.physik.uni-augsburg.de/~zirkelfr/download/posic/c_in_si_pqmig_albe.avi}{$\rhd_{\text{remote url}}$})
+ \end{itemize}
\begin{minipage}{6.5cm}
- Result:
- (Video \href{../video/c_in_si_pmig_albe.avi}{$\rhd_{\text{local}}$ } $|$
- \href{http://www.physik.uni-augsburg.de/~zirkelfr/download/posic/c_in_si_pmig_albe.avi}{$\rhd_{\text{remote url}}$})\\
- \includegraphics[width=6cm]{c_100_110pmig_01_albe.ps}
+ \includegraphics[width=6cm]{c_100_110pqmig_01_albe.ps}
\end{minipage}
\begin{minipage}{6cm}
\begin{itemize}
- \item Jump in energy (25 and 75 \%) corresponds to the abrupt
- structural change (as seen in the video)
+ \item Jump in energy corresponds to the abrupt
+ structural change (as seen in the videos)
\item Due to the abrupt changes in structure and energy
this is {\color{red}not} the correct migration path and energy!?!
\end{itemize}
}
\small
- \vspace*{1cm}
- \ldots simulations running!
- \vspace*{1cm}
- \begin{minipage}{5cm}
-
- \end{minipage}
+ {\color{blue}Method:}
+ \begin{itemize}
+ \item Place interstitial carbon atom at the respective coordinates
+ into perfect c-Si
+ \item 110 direction fixed for the C atom
+ \item $4\times 4\times 3$ Type 1, $198+1$ atoms
+ \item Atoms with $x=0$ or $y=0$ or $z=0$ fixed
+ \end{itemize}
+ {\color{blue}Results:}
+ (Video \href{../video/c_in_si_pmig_vasp.avi}{$\rhd_{\text{local}}$ } $|$
+ \href{http://www.physik.uni-augsburg.de/~zirkelfr/download/posic/c_in_si_pmig_vasp.avi}{$\rhd_{\text{remote url}}$})\\
\begin{minipage}{7cm}
-
+ \includegraphics[width=7cm]{c_100_110pmig_01_vasp.ps}
+ \end{minipage}
+ \begin{minipage}{5.5cm}
+ \begin{itemize}
+ \item Characteristics nearly equal to classical calulations
+ \item Approximately half of the classical energy
+ needed for migration
+ \end{itemize}
+ \begin{center}
+ Preliminary: 20 \% calculation still running
+ \end{center}
\end{minipage}
-
\end{slide}