Module 6 : PHYSICS OF SEMICONDUCTOR DEVICES
Lecture 31 : Electron in a Periodic Potential
 
 
\includegraphics{bragg.eps}
   
  Thus energy is continuous in the region $ -\pi/d < k < +\pi/d$. At $ k=\pm\pi/d$ there is a discontinuity. The region between $ -pi/d$ and $ +\pi/d$ is the first Brillouin zone.
 
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