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Exciton magnetic polaron in Cd1–xMnxTe single semimagnetic quantum ring

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Abstract

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–xMnxTe diluted magnetic quantum ring. The quantum ring with two different configurations: (i) the non-magnetic ring (CdTe) embedded in the semimagnetic Cd1–xMnxTe matrix and (ii) magnetically non-uniform quantum structures embedded with \(\mathrm {Mn^{2+}}\) ions both in the ring and in the barrier regimes, has been investigated for various mole fractions of the Mn dopants. The larger polaron binding energy (\(E_{{{\text{MP}}}}\)) 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 as exchange 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 \(E_{{{\text{MP}}}}\) in an external magnetic field and with the contradictory tendencies of \(E_{{{\text{MP}}}}\) 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.

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  1. Department of Electrical Engineering, Indian Institute of Technology, Powai, Mumbai, Maharashtra, 400076, India

    Kalpana Panneerselvam & Bhaskaran Muralidharan

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Correspondence to Kalpana Panneerselvam or Bhaskaran Muralidharan.

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Panneerselvam, K., Muralidharan, B. Exciton magnetic polaron in Cd1–xMnxTe single semimagnetic quantum ring. Eur. Phys. J. Plus 139, 319 (2024). https://doi.org/10.1140/epjp/s13360-024-05031-3

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