Photoionization cross section of donor single dopant in multilayer quantum dots under pressure and temperature effects

Jaouane M., Sali A., Fakkahi A., Arraoui R., Ed-Dahmouny A., Ungan F.

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, cilt.144, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 144
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.physe.2022.115450
  • Dergi Adı: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Applied Science & Technology Source, Compendex, Computer & Applied Sciences, INSPEC
  • Anahtar Kelimeler: FEM, Photoionization cross section, Electron confinement, Quantum dots, Oscillator strength, Binding energy, BINDING-ENERGY, HYDROSTATIC-PRESSURE, EXCITON-STATES, IMPURITY, CORE/SHELL, FIELD, GAN
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

The shallow donor single dopant confined in the multilayer cylindrical quantum dots is investigated numerically within the framework of effective-mass approximation. The Schro spacing diaeresis dinger equation that governs the wave function of a complicated system is solved numerically by the finite element method using the Python programming language. The results indicate that the photoionization cross section (PCS) is similar to the Gauss function curve, the height of the curve's peak is proportional to oscillator strength, and the center peak position is related to the impurity binding energy. These two last parameters are dependent on the distribution of probability density across each part of the system. The probability density is tuned by the electron confinement and optical tran-sition. The augmentation of dot radius or temperature decreases the electron confinement, which causes a redshift of PCS, and the presence of hydrostatic pressure blue shifts the PCS. On the other side, As the dot radius and hydrostatic pressure are increased, the oscillator's strength increases, raising values near the critical energy, and vice versa for temperature.