Impurity-related optical response in a 2D and 3D quantum dot with Gaussian confinement under intense laser field


Sari H., Kasapoglu E., Sakiroglu S., Sokmen I., Duque C. A.

PHILOSOPHICAL MAGAZINE, vol.100, no.5, pp.619-641, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 100 Issue: 5
  • Publication Date: 2020
  • Doi Number: 10.1080/14786435.2019.1695166
  • Journal Name: PHILOSOPHICAL MAGAZINE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.619-641
  • Keywords: Gaussian quantum dot, nonresonant intense laser field, optical absorption, SHALLOW DONOR IMPURITIES, MAGNETIC-FIELD, TRANSITIONS, ELECTRON, ENERGY, SIZE, PHOTOLUMINESCENCE, ABSORPTION, SPECTRUM, STATES
  • Dokuz Eylül University Affiliated: Yes

Abstract

Using the two-dimensional (2D) diagonalisation method, the impurity-related electronic states and optical response in a 2D quantum dot with Gaussian confinement potential under nonresonant intense laser field are investigated. The effects of a hydrogenic impurity on the energy spectrum and binding energy of the electron and also intersubband optical absorption are calculated. The obtained numerical results show that the degeneracies of the excited electron states are broken and the absorption spectrum exhibits a redshift with the values of the laser field. The findings indicate a new degree of freedom to tune the performance of novel optoelectronic devices, based on the quantum dots and to control their specific properties by means of intense laser field and hydrogenic donor impurity. Using the same Gaussian confinement model, the electronic properties of a confined electron in the region of a spherical quantum dot are studied under the combined effects of on-centre donor impurity and a linearly polarised intense laser radiation. The three-dimensional problem is used to theoretically model, with very good agreement, some experimental findings reported in the literature related to the photoluminescence peak energy transition.