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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La Sylphide (English: The Sylph) is a romantic ballet. It was created for Marie Taglioni by her father Filippo Taglioni to showcase her talents.The ballet was first performed in the Salle Le Peletier in Paris on March 12, 1832. The ballet was a great success. Taglioni was regarded as the greatest ballerina of the age.a Sylphide (English: The Sylph) is a romantic ballet. It was created for Marie Taglioni by her father Filippo Taglioni to showcase her talents.