Intense terahertz laser field induced electro-magneto-donor impurity associated photoionization cross-section in Gaussian quantum wires

Peter A. J., Mora-Ramos M., UNGAN F.

Physica E: Low-Dimensional Systems and Nanostructures, cilt.143, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 143
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.physe.2022.115270
  • Dergi Adı: Physica E: Low-Dimensional Systems and 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: Gaussian quantum well wire, Impurity binding energy, Photoionization cross section, Nonlinear optical response, Electric field, Magnetic field, Intense laser field, BINDING-ENERGY, WELL-WIRE, HYDROSTATIC-PRESSURE, DOTS
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

© 2022 Elsevier B.V.Using expressions derived within the compact density matrix approach, the peaks of optical absorption and the changes of refractive index of a hydrogenic impurity in a GaAs/GaAlAs Gaussian quantum well wire are calculated taking into account the influence of static electric, magnetic and intense laser fields. The photoionization cross section, with normalized photon energy, is computed for different values of static electric field, magnetic field, and laser dressing parameter. The dipole moment matrix elements and the transition energy between ground and first excited state energy levels are computed as functions of quantum wire width and confinement potential depth, with and without external perturbations. Donor impurity binding energy is investigated in presence of the aforementioned electromagnetic probes, using parabolic band and effective mass approximations. The results show that the absorption coefficients depend on the transition energy difference between initial and final states involved as well as on the corresponding polarization response via dipole matrix elements. Discussed optical properties are field-sensitive and they can be tuned within the desired energy ranges using these external perturbations.