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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BRUSSELS, Dec. 24â Pierre Culliford, who created the blue cartoon dwarfs known as Smurfs, died today at his home. He was 64 years old. Mr. Culliford, who drew under the name Peyo, died one month after the publication of his 16th Smurf book, said his publisher, Editions Lombard S.A. The announcement gave no cause of death. Mr. Culliford was born in Brussels in 1928, and became a cartoonist at a Brussels film company in 1944.