VIOLATION OF THE DELTA-N=0 SELECTION RULE FOR OPTICAL-TRANSITIONS IN MAGNETIC SAWTOOTH QUANTUM-WELLS

Sawtooth quantum wells, in which the graded gap is produced by a linea r variation in the concentration of a magnetic ion, offer a unique opp ortunity to investigate the additional optical transitions resulting f rom symmetry breaking. In the present theoretical work linear variatio ns in the concentration of the magnetic Mn2+ ion in the Cd1-xMnxTe all oy permits a study of the variation of both the energy and oscillator strength of forbidden transitions as a function of the external magnet ic field. The resulting variations in the symmetry of the system produ ces profound effects on the oscillator strengths of the DELTAn not-equ al 0 transitions.