Harmonic Oscillator Energy vs. Angular Frequency

Harmonic oscillator energy vs angular frequency omega

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% harmonic oscillator energy vs angular frequency omega
\documentclass{standalone}
\usepackage{pgfplots,mathtools}
\pgfplotsset{compat=newest}
\begin{document}
\begin{tikzpicture}
  \begin{axis}[
      xlabel = $\omega$,
      ylabel = $\langle E\rangle/k_\text{B} T$,
      domain = 0.01:11,
      ymin = 0,
      smooth,thick,
      axis lines = center,
      every tick/.style = thick]
    \def\h{1}\def\b{1}
    \def\eev{1/2*\h*x*(1 + 4/(e^(\b*\h*x) - 1))}
    \addplot[color=blue]{\eev};
  \end{axis}
\end{tikzpicture}
\end{document}
 
 
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