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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This unforgettable video by the UK arm of Save The Children gives the one second in a day video trope a terrifying twist. It depicts a young British girl whose life transforms from family gatherings and innocent playtime to a harrowing struggle to survive.