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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Grace Vanderwaal has officially stolen Americaâs heart. The 12-year-old ukulele player, who had the honor of being the closing act, wowed everyone with a performance of her original song âClayâ on night one of the Americaâs Got Talent finale Tuesday. And judges Simon Cowell, Heidi Klum, Howie and Mel B gave Vanderwaal a standing ovation with her self-penned tune. âAmazing Grace. How sweet the sound,â said Mandel, who chose her as his golden buzzer contestant. âItâs not only a song. It speaks to you. You are amazing. Grace has to win. This is my favorite moment of the night.â