Impurity-related optical properties of a laser-driven quantum dot

Kilic D. G., Sakiroglu S., Sokmen I.

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, cilt.102, ss.50-57, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 102
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.physe.2018.04.028
  • Dergi Adı: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.50-57
  • Anahtar Kelimeler: Quantum dot, Impurity, Intense laser field, Nonlinear optics, REFRACTIVE-INDEX CHANGES, PHOTOIONIZATION CROSS-SECTION, RECTIFICATION COEFFICIENT, ABSORPTION-COEFFICIENTS, HYDROSTATIC-PRESSURE, ELECTRONIC-STRUCTURE, DONOR IMPURITIES, BINDING-ENERGY, DISK, RINGS
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this paper, we explore theoretically the effect of an on-center Gaussian impurity on the optical properties of a laser-driven parabolic quantum dot system under uniform magnetic field. Laser radiation with circular polarization has been treated within the framework of high-frequency Floquet approach. The linear and third-order nonlinear optical absorption coefficients and refractive index changes have been examined by means of the compact-density matrix approach. Numerical results reveal that the position and magnitude of the resonant peaks of absorption coefficients and refractive index changes are sensitively affected by magnetic field, the depth and the range of the impurity potential. Besides, the presence of intense laser field causes a red-shift in the positions and reduction in the amplitudes of the resonant peaks of optical characteristics.