Exciton magnetic polaron in Cd1-xMnxTe single semimagnetic quantum ring

Magnetically doped nanostructures can significantly enhance the interaction between the band carriers and the dopant atoms. Motivated by the demonstration of the enhanced sp-d exchange interaction in quantum confined structures with the increased stability of the exciton magnetic polaron, we report the quantitative and qualitative analyses of the exciton magnetic polaron formation in CdTe/Cd1-x Mn xTe diluted magnetic quantum ring. The quantum ring with two different configurations: (i) the non-magneticring (CdTe) embedded in the semimagnetic Cd1-xMnxTe matrix and (ii) magnetically non-uniform quantum structures embeddedwith Mn(2+)ions both in the ring and in the barrier regimes, has been investigated for various mole fractions of the Mn dopants. Thelarger polaron binding energy (EMP) of 23 meV is estimated for the 5% molar Mn contents compared to the other quantum confined systems made of CdMnTe. The magnetic field dependence of the MP energy and the corresponding polaron parameters such asexchange field, localization radius of the MP, and the degree of circular polarization induced by the external applied magnetic field at T=4.2 K have been derived. The obtained results are in excellent agreement with the trend of the significant degradation of EMP in an external magnetic field and with the contradictory tendencies of EMP for the QR with configurations (i) and (ii), as reported from the time-integrated measurements based on selective excitation for the quantum systems made of CdMnTe and other DMS materials.