Theoretical study of photoionization cross-section in doped spherical quantum dots under magnetic field
Micro and Nanostructures, cilt.219, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 219
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.micrna.2026.208855
- Dergi Adı: Micro and Nanostructures
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Anahtar Kelimeler: Finite element method, Magnetic field, Multilayered spherical quantum dot, Photoionization cross section
- Sivas Cumhuriyet Üniversitesi Adresli: Evet
Özet
Within the effective mass approximation, three-dimensional numerical simulations of GaAs/AlGaAs multilayered spherical quantum dots under an external magnetic field are performed using the finite element method. The time-independent Schrödinger equation is solved to obtain the discrete energy levels and wave functions, both with and without a hydrogenic donor impurity. These results are used to evaluate the donor binding energy and compute the photoionization cross-section through a Python-based numerical approach, allowing detailed analysis of optical transitions. The results show that the donor binding energy increases with magnetic field strength, with the enhancement strongly influenced by structural parameters such as core radius, well width, and barrier thickness. In addition, the photoionization cross-section exhibits a blue shift and intensity variations depending on both geometry and field amplitude. This study provides valuable insight into the electronic structure and optical properties of multilayered quantum dots and supports their potential applications in tunable optoelectronic and quantum devices.