Behavior of excitonic binding energy in single and double 'GA''AS'/'AL''GA''AS' quantum wells - Lopes, E M; Quivy, Alain André; César, D F; Franchello, F; Duarte, J L; Dias, I F L; Laureto, E; Guimarães, P S S; Tanaka, R Y (Econtro de Física, 2011)