deletions | additions       diff --git a/section_Topological_Insulators.tex b/section_Topological_Insulators.tex  index 474f236..a6d3586 100644  --- a/section_Topological_Insulators.tex  +++ b/section_Topological_Insulators.tex 
...
For topological insulators like HgTe/CdTe quantum wells, effective energy dispersions have been found to represent the bands of interest using a two band model.  \begin{equation}  E\pm=\epsilon(k)\pm \sqrt{A^2(kx^2+ky^2)+M^2} \sqrt{A^2(kx^2+ky^2)+M^2(k)}  \end{equation}  \begin{equation}  \epsilon(k)=C-D(kx^2+ky^2)  \end{equation}  \begin{equation}  M(k)=M-B(kx^2+ky^2)  \end{equation}