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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Share this page. Precious and Few, the third volume of Time Life's nine-disc Romancing the 70s series, features 18 sugary soft rock, easy listening, and pop radio staples, including âAnnieâs Songâ (John Denver), â(Last Night) I Didn't Get to Sleep at Allâ (the 5th Dimension), âBaby Don't Get Hooked on Meâ (Mac Davis), and many more.