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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History of Miller-Rogaska Crystal. The founding mission of Miller-Rogaska Crystal is to offer excellent quality and design at an exceptional value. John Miller founded Miller-Rogaska Crystal in 1984. Prior to this venture, John served as the founding president of Waterford USA for nearly twenty-five years.ohn Miller's inspiration for establishing the company came after visiting the Rogaska factory in what was, at the time, Yugoslavia. The factory, located in the spa village of Rogaska, Slovenia, had been producing full lead, handmade crystal for over 75 years.