Influence of symmetry and Coulomb-correlation effects on the optical properties of nitride quantum dots

Abstract

The electronic and optical properties of self-assembled InN/GaN quantum dots (QDs) are investigated by means of a tight-binding model combined with configuration interaction calculations. Tight-binding single particle wave functions are used as a basis for computing Coulomb and dipole matrix elements. Within this framework, we analyze multi-exciton emission spectra for two different sizes of a lens-shaped InN/GaN QD with wurtzite crystal structure. The impact of the symmetry of the involved electron and hole one-particle states on the optical spectra is discussed in detail. Furthermore we show how the characteristic features of the spectra can be interpreted using a simplified Hamiltonian which provides analytical results for the interacting multi-exciton complexes. We predict a vanishing exciton and biexciton ground state emission for small lens-shaped InN/GaN QDs. For larger systems we report a bright ground state emission but with drastically reduced oscillator strengths caused by the quantum confined Stark effect.

15 pages, 17 figures

References in corpus (2)

• Excitonic properties of strained wurtzite and zinc-blende GaN/Al(x)Ga(1-x)N quantum dots
• Interrelation of structural and electronic properties of InGaN/GaN quantum dots using an eight-band k.p model

Cited by in corpus (3)

• Polarized emission of GaN/AlN quantum dots : single dot spectroscopy and symmetry-based theory
• A comparison of atomistic and continuum theoretical approaches to determine electronic properties of GaN/AlN quantum dots
• Spin-orbit coupling and crystal-field splitting in the electronic and optical properties of nitride quantum dots with a wurtzite crystal structure