The effect of Coulomb interaction on optical absorption of a quantum well wire

Ustoglu Unal V., TOMAK M., Aksahin E.

Physica B: Condensed Matter, vol.680, 2024 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 680
  • Publication Date: 2024
  • Doi Number: 10.1016/j.physb.2024.415799
  • Journal Name: Physica B: Condensed Matter
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Coulomb interaction, Nonlinear absorption, Quantum wire
  • Middle East Technical University Affiliated: Yes

Abstract

The optical absorption coefficient in GaAs/AlGaAs cylindrical parabolic quantum wire (QW) with an applied static-electric field is studied in detail. The Schrödinger equation is solved within the effective mass approximation and an analytical solution is used for the electronic structure of cylindrical QW. The main aim is to clarify the effect of the Coulomb interaction on the exciton-related optical absorption of a QW with no assumptions about the strength of the confinement. Finally, it is clearly shown that the further confinement due to Coulomb interaction in a quantum wire increases the transition energy, dipole matrix elements, and absorption peaks, and results with the blue shift. One cannot neglect the Coulomb interaction in the absorption calculations.