title: Configure org mode to use LuaLaTeX
body: <p>I'm using emacs' <code>org-mode</code> to typeset notes and export them in pdf via LaTeX. Everything works fine, except when I use Unicode symbols, like in </p>
  
  <pre><code>\begin{equation}
    \left( \frac{P^2}{2m} + V(x,y,z) \right) Ψ = E Ψ
  \end{equation}
  </code></pre>
  
  <p>where I use <code>Ψ</code>. Using <code>#+latex_compiler: lualatex</code> and</p>
  
  <pre><code>(setq org-latex-pdf-process
        '("lualatex -shell-escape -interaction nonstopmode %f"
          "lualatex -shell-escape -interaction nonstopmode %f")) 
  </code></pre>
  
  <p>I have managed to export with more or less problems to PDF using LuaLaTeX, but the previews of the formulae (<code>C-c C-x C-l</code>) are completely broken for the ones with Unicode symbols.</p>
  
  <p>What changes do I need to make in my emacs configuration to be able to use LuaLaTeX for <em>everything</em> related to LaTeX in <code>org-mode</code>?</p>