Coupled effects of magnetic fields and hydrogenic impurities on the absorption coefficients and refractive index changes in multilayer-quantum dot systems

Fakkahi A., BAŞER P., Azmi H., Jaouane M., Sali A., Ed-Dahmouny A., ...Daha Fazla

Micro and Nanostructures, cilt.209, 2026 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 209
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.micrna.2025.208398
  • Dergi Adı: Micro and Nanostructures
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Intersubband transition energy, Magnetic field, Multilayered spherical quantum dot, Optical absorption coefficient, Refractive index changes, Shallow hydrogenic donor impurity
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

This study investigates the optical characteristics of multilayered spherical quantum dots (MSQDs) through the application of the finite element method (FEM). We systematically examine the effects of varying layer dimensions, the presence of a shallow hydrogenic donor impurity, and the application of an external magnetic field on the linear, third-order nonlinear, and total optical absorption coefficients (OACs), as well as refractive index variations. The results reveal strong correlations between structural parameters, magnetic field and shallow donor impurity. In particular, small adjustments in layer thicknesses lead to significant changes in both linear and third-order nonlinear absorption, underscoring the critical influence of quantum confinement. Moreover, the magnetic field is shown to play a pivotal role in tuning the optical properties of the system, markedly affecting both absorption behavior and refractive index modulation. This work provides a comprehensive understanding of how geometrical parameters, impurity presence, and magnetic fields collectively influence the optoelectronic properties of MSQDs. These findings not only deepen fundamental insight but also offer strategic guidance for the design of advanced nanophotonic devices with tailored optical functionalities.