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<p>Quantum rings exhibit rich physical properties due to quantum confinement and Aharonov–Bohm (AB) oscillations. While impurity-free and central-impurity rings have been widely studied, the role of anisotropic dipolar impurities remains less explored. In this work, we develop a theoretical model for a quantum ring containing a dipolar impurity under AB flux. Analytical solutions are obtained for the energy spectrum and wavefunctions, and the density-matrix formalism is employed to evaluate linear and nonlinear optical responses, including absorption, refractive index changes, and harmonic generation. Our study emphasizes the combined effect of flux periodicity and impurity-induced anisotropy as dual control parameters, highlighting the potential of dipolar impurity quantum rings for tunable nanoscale optoelectronic and photonic applications.</p>

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Electronic structure and optical properties of quantum rings with dipolar impurities under Aharonov–Bohm flux

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Sek Lakhdar

摘要

Quantum rings exhibit rich physical properties due to quantum confinement and Aharonov–Bohm (AB) oscillations. While impurity-free and central-impurity rings have been widely studied, the role of anisotropic dipolar impurities remains less explored. In this work, we develop a theoretical model for a quantum ring containing a dipolar impurity under AB flux. Analytical solutions are obtained for the energy spectrum and wavefunctions, and the density-matrix formalism is employed to evaluate linear and nonlinear optical responses, including absorption, refractive index changes, and harmonic generation. Our study emphasizes the combined effect of flux periodicity and impurity-induced anisotropy as dual control parameters, highlighting the potential of dipolar impurity quantum rings for tunable nanoscale optoelectronic and photonic applications.