ELECTRIC FIELD EFFECTS ON EXCITONS IN Alx Ga1-x As QUANTUM WELLS AND THEIR APPLICATIONS TO OPTOELECTRONIC DEVICES S. TARUCHA et K. PLOOG J. Phys. Colloques, 48 C5 (1987) C5-85-C5-92 DOI: 10.1051/jphyscol:1987514