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Coulomb correlated multiparticle states of weakly confining GaAs quantum dots

Petr Klenovský*

  • *Contact author: klenovsky@physics.muni.cz
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Phys. Rev. B 113, 125410 – Published 10 March, 2026

DOI: https://doi.org/10.1103/wjw9-blb1

Abstract

We compute the electronic and emission properties of Coulomb–correlated multiparticle states (X0, X±, XX) in weakly confining GaAs/AlGaAs quantum dots using an eight-band k·p model coupled to continuum elasticity and configuration interaction (CI). We evaluate polarization-resolved oscillator strengths and radiative rates both in the dipole approximation and in a quasielectrostatic beyond-dipole (BDA) longitudinal formulation implemented via a Poisson reformulation exactly equivalent to the dyadic Green-tensor kernel. For the dots studied, BDA yields lifetimes in quantitative agreement with experiments, e.g., τX=0.279ns vs 0.267ns (exp.) and τXX=0.101ns vs 0.115ns (exp.). The framework also reproduces electric-field tuning of the multiparticle electronic structure and emission—including the indistinguishability inferred from P=τX/(τX+τXX)—and we assess sensitivity to CI-basis size and to electron–electron and hole–hole exchange.

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Phys. Rev. B 113, 125410– Published 10 March, 2026
  • Received 26 October 2025
  • Revised 7 January 2026
  • Accepted 19 February 2026
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