ODMR evidence of electronic cascade in multiple asymmetrical (CdMn)Te quantum wells

Exchange-coupled complexes consisting of Mn ions and holes were revealed by optically detected magnetic resonance in the narrowest quantum wells of asymmetrical multiple-quantum-well structures (CdMn)Te/(CdMg)Te. Calculations were performed to estimate the parameters of the complexes (exchange interactions and hole $g$-factors) and simulate the spectra. The formation of such complexes implies the directional electron tunneling from narrow to larger wells, i.e. an electronic cascade, which results in the creation of the excess hole concentration in the narrowest and intermediate-width quantum wells.