BSE_JPCLperspective/TOC/TOC.tex

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\documentclass{standalone}
\usepackage{amsmath,amssymb,amsfonts,pgfpages,graphicx,subfigure,xcolor,bm,multirow,microtype,wasysym,multimedia,hyperref,tabularx,amscd,pgfgantt,mhchem,physics}
\usetikzlibrary{shapes.gates.logic.US,trees,positioning,arrows}
\usepackage{tgchorus}
\usepackage[T1]{fontenc}
\begin{document}
\begin{tikzpicture}
\begin{scope}[very thick,
node distance=5cm,on grid,>=stealth',
block1/.style={rectangle,draw,fill=violet!20},
block2/.style={rectangle,draw,fill=blue!20},
comp1/.style={rectangle,draw,fill=purple!40},
comp2/.style={circle,draw,fill=green!40},
comp3/.style={rectangle,fill=white!40}]
\node [block1, text width=7cm, align=center] (KS)
{\textbf{\LARGE Kohn-Sham DFT}
$$
\qty[ -\frac{\nabla^2}{2} + v_\text{ext} + V^{\text{Hxc}} ] \phi_p^{\text{KS}} = \varepsilon^{\text{KS}}_p \phi_p^{\text{KS}}
$$
};
\node [block2, text width=7cm, align=center] (GW) [below=of KS, yshift=2cm]
{\textbf{\LARGE $GW$ approximation}
$$
\varepsilon_p^{GW} = \varepsilon_p^{\text{KS}} +
\mel{\phi_p^{\text{KS}}}{\Sigma^{GW}(\varepsilon_p^{GW}) - V^{\text{xc}}}{\phi_p^{\text{KS}}}
$$
};
\node [comp1, text width=7cm, align=center] (BSE) [below=of GW, yshift=2cm]
{\textbf{\LARGE Bethe-Salpeter equation}
$$
\begin{pmatrix}
R & C \\
-C^* & R^{*}
\end{pmatrix}
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\begin{pmatrix}
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X_m \\
Y_m
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\end{pmatrix}
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=
\Omega_{m}
\begin{pmatrix}
X_m \\
Y_m
\end{pmatrix}
$$
};
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% \node [comp2, align=center] (phys) [left=of BSE, xshift=-2cm]
% {\LARGE Molecules};
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% \node [comp2, align=center] (chem) [below=of BSE, xshift=0cm]
% {\LARGE Materials};
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% \node [comp2, align=center] (bio) [right=of BSE, xshift=2cm]
% {\LARGE Clusters};
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\path
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(KS) edge [->,color=black] node [right,black] {\LARGE Fundamental gap} (GW)
(GW) edge [->,color=black] node [right,black] {\LARGE Excitonic effect} (BSE)
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% (BSE) edge [->,color=black] node [above,black] {} (phys)
% (BSE) edge [->,color=black] node [above,black] {} (chem)
% (BSE) edge [->,color=black] node [above,black] {} (bio)
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;
\end{scope}
\end{tikzpicture}
\end{document}