Coulomb correlated multi-particle states of weakly confining GaAs quantum dots

2025/10/26 by Klenovský, Petr
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)

paper · doi:10.48550/arxiv.2510.22717

Abstract

We compute the electronic and emission properties of Coulomb-correlated multi-particle states (X⁰, X^±, XX) in weakly confining GaAs/AlGaAs quantum dots using an 8-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 (DA) and in a quasi-electrostatic 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 experiment, e.g., τ^X=0.279 ns vs 0.267 ns (exp.) and τ^XX=0.101 ns vs 0.115 ns (exp.). The framework also reproduces electric-field tuning of the multi-particle electronic structure and emission -- including the indistinguishability inferred from P=τ^X/(τ^X+τ^XX) -- and we assess sensitivity to CI-basis size and to electron-electron and hole-hole exchange.

Citations

• Few-electron spin qubits in optically active GaAs quantum dots
• Electric-field control of photon indistinguishability in cascaded decays in quantum dots

Related

• Coulomb correlated multi-particle polarons
• Modeling the g-factors, hyperfine interaction and optical properties of semiconductor QDs: the atomistic and eight-band k ⋅ p approaches
• Interplay between multipole expansion of exchange interaction and\n Coulomb correlation of exciton in colloidal II-VI quantum dots
• Collective properties of electrons and holes in coupled quantum dots
• Simple correlated wave-functions for excitons in 0D, quasi-1D and\n quasi-2D quantum dots