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Created Dec 11, 2017

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\documentclass{article}
\pagestyle{empty}
\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\usepgfplotslibrary{groupplots}
\usetikzlibrary{calc}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}
% =================== Binding energy graph ========================
\node [anchor=south west] (nodeEb) at (-0.1,-0.1){};
\node [anchor=south west] (DOS) at (2.2,-0.5){};
\begin{axis}
[ % graph position
at={(nodeEb)},
ticks = none,
set layers,
axis on top,
axis line style = thick,
width=7.5cm,
height=7cm,
axis lines=center,
domain=0:5,
samples=100,
xmin=0, xmax=3,
ymin=0, ymax=8,
xlabel style={at={(DOS)},anchor=west},
y label style={at={(axis description cs:-0.1,0.3)},anchor=south},
xlabel={DOS},
ylabel={$E_{B}$}
]
% Fermi energy
\addplot[color=teal, domain=0:5.9,samples=100, name path=fermi]({0.5*(x-4)^(0.5)},{x});
% Fill under Fermi
\path[name path=axis] (axis cs:0,3.9) -- (axis cs:0,5.9);
\addplot [thick, color=teal, fill=teal,]
fill between[of=fermi and axis,];
\end{axis}
\draw [thick,teal] (0,0.5) -- (4,0.5); % Core energy top
\draw [thick,teal] (0,1.4) -- (3,1.4); % Core energy bottom
\draw [thick,teal] (0.05,0) -- (0.05,3); % Baseline
% ======== Kinetic energy graph =========
\node [anchor=south west] (nodeEk) at (5.7,4.4){}; % Node plot E_k
% Axis label nodes
\node (Int) at (7.5,4.22) {};
\node (Ek) at (5.8,10){};
% Ek plot
\begin{axis}
[
at={(nodeEk)},
ticks = none,
set layers,
axis on top,
axis line style = thick,
width=5.5cm,
height=7cm,
axis lines=center,
domain=0:5,
samples=100,
xmin=0, xmax=3,
ymin=0, ymax=8,
xlabel style={at={(Int)},anchor=west},
ylabel style={at={(Ek)},anchor=west},
xlabel={Intensity},
ylabel={$E_{K}$}
]
% core signals
\addplot[color=teal,fill=teal, domain=0:4,samples=1000, name path=peak1] ({0.03/pi*(1/(1+4*(x-1))^2)+7/pi*(0.005/(0.005+4*(x-2)^2))},{x});
% Fermi energy
\addplot[color=teal, domain=0:7,samples=100, name path=fermi]({0.7*(x-4)^(0.5)/(e^((x-6)/0.1)+1)},{x});
% Fill under Fermi
\path[name path=axis] (axis cs:0,3.9) -- (axis cs:0,10);
\addplot [thick, color=teal, fill=teal,]
fill between[of=fermi and axis,];
\end{axis}
% ======== Supporting lines ==============
\draw [thick,dashed] (3.1,1.4) -- (9.8,1.4); % Upper core level Eb
\draw [thick,dashed] (0,4) -- (8,4); % Fermi energy Eb
\draw [thick] (0,5) -- (3.5,5) -- (5.8,4.53); % E_{Vac}
\draw [thick,dashed] (8.9,5.9) -- (9.8,5.9); % Upper core level Ek
\draw [thick,dashed] (5.9,8.55) -- (9.8,8.55); % Fermi energy Ek
% ======== Arrows =========================
\draw[thick,<->] (2.2,4.1)--(2.2,4.9); % Surface work function
\draw [thick,<->] (5.9,4.1) -- (5.9,4.4); % Analyzer work function
\draw[thick,->] (-0.5,1.7)--(-0.5,0.7); % Binding energy arrow
\draw [violet,very thick, decorate, decoration={snake}, ->] (9.2,1.5)--(9.2,5.7); % Photon
% =========== Text ========================
\node at (2.5,4.5){$\Phi_{S}$}; % Surface work function
\node at (6.3,4.22){$\Phi_{A}$}; % Analyzer work function
\node at (-0.5,4){$E_{F}$}; % E_F Binding energy graph
\node at (-0.5,5){$E_{V}$}; % Vacuum energy level
\node at (5.4,8.55){$E_{F}$}; % E_F Kinetic energy graph
\node at (2.3,3.4){Valence band}; % Valence band
\node at (4.2,1){Core levels}; % Core levels
\node at (8.5,2.8){\large $h\nu$}; % Photon
\node at (2.1,6){\Large \textbf{Sample}}; % Sample text
\node at (8,9.5){\Large \textbf{Analyzer}}; % Analyzer text
\end{tikzpicture}
\caption{Photoemission process}
\label{fig:photoemission}
\end{figure}
\end{document}
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