For both Si and GaAs the maximum valence band energy of an electron occurs at Â¯p= 0. The minimum energy of the conduction band electron in GaAs also occurs for Â¯p= 0, hence a transition across the bandgap only requires an E g energy absorbtion or emission. Because of this, GaAs is called a direct semi-conductor.
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Violet Beauregarde (Character) from Charlie and the Chocolate Factory (2005) The content of this page was created by users. It has not been screened or verified by IMDb staff.