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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Obituary: Jim Delligatti / Pittsburgh-area McDonald's franchisee who created Big Mac. Aug. 2, 1918 - Nov. 28, 2016. Big Mac creator Michael Jim Delligatti sits behind a Big Mac birthday cake at his 90th birthday party in Canonsburg in 2008. Mr. Delligatti, of Fox Chapel, died Monday at the age of 98.