METASTABLE EXCITONS IN ZNSE ZN1-XFEXSE QUANTUM-WELLS/

We present an optical (reflectance and photoluminescence) study of met astable excitons in ZnSe/Zn1-xFexSe quantum-well structures. These sta tes asr associated with the type-II (-1/2, -3/2) ground state exciton of the system. The metastable excitons are formed because the Coulomb attraction of the m(j)=-1/2 electron tends to localize the m(j)=-3/2 h ole in the vicinity of the electron. This complex breaks apart as the temperature increases, and the system returns to its ground state in w hich the m(j)=-1/2 electron and the m(j)=-3/2 hole as segregated.