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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In his new book, These Few Precious Days, author Christopher Andersen claims despite all of their difficulties, it was their years in the White House that brought Jack and Jackie the closest, before that fateful day in Dallas took it all away. And Christopher Andersen is with us now.