Donor impurity states and related optical responses in triangular quantum dots under applied electric field


Kasapoglu E. , Ungan F. , Sari H. , Sokmen I., Mora-Ramos M. E. , Duque C. A.

SUPERLATTICES AND MICROSTRUCTURES, cilt.73, ss.171-184, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 73
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.spmi.2014.05.023
  • Dergi Adı: SUPERLATTICES AND MICROSTRUCTURES
  • Sayfa Sayıları: ss.171-184

Özet

The linear and nonlinear coefficients for the optical absorption and relative refractive index change associated with transitions between donor impurity states in a two-dimensional quantum dot of triangular shape under applied electric field are calculated for y-polarization of the incident light. Both the effective mass and parabolic band approximations have been considered. The results show that the application of a DC electric field strengthens the impurity-related optical absorption response, with particular relevance in the case of the nonlinear contribution to it. However, for a fixed donor atom position inside the triangular quantum dot, the calculations show that the in-plane orientation of the applied field can becomes a critical parameter that may lead to a strong quenching of the interstate light absorption. (C) 2014 Elsevier Ltd. All rights reserved.