Optical coefficients in a semiconductor quantum ring: Electric field and donor impurity effects

Duque C. M., Acosta R. E., Morales A. L., Mora-Ramos M. E., Restrepo R. L., Ojeda J. H., ...Daha Fazla

OPTICAL MATERIALS, cilt.60, ss.148-158, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 60
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.optmat.2016.07.024
  • Dergi Adı: OPTICAL MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.148-158
  • Anahtar Kelimeler: Quantum rings, Electric field, Donor impurity, Optical absorption, Second harmonic generation, ABSORPTION, DOTS, WELLS, MODEL
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

The electron states in a two-dimensional quantum dot ring are calculated in the presence of a donor impurity atom under the effective mass and parabolic band approximations. The effect of an externally applied electric field is also taken into account. The wavefunctions are obtained via the exact diagonalization of the problem Hamiltonian using a 2D expansion within the adiabatic approximation. The impurity-related optical response is analyzed via the optical absorption, relative refractive index change and the second harmonics generation. The dependencies of the electron states and these optical co-efficients with the changes in the configuration of the quantum ring system are discussed in detail. (C) 2016 Elsevier B.V. All rights reserved.