Binding energies of excitonic complexes in type-II quantum rings from diffusion quantum Monte Carlo calculations

Thomas, David and Hunt, Ryan James and Drummond, Neil David and Hayne, Manus (2019) Binding energies of excitonic complexes in type-II quantum rings from diffusion quantum Monte Carlo calculations. Physical Review B: Condensed Matter and Materials Physics, 99 (11). ISSN 1098-0121

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Abstract

Excitonic complexes in type-II quantum-ring heterostructures may be considered as artificial atoms due to the confinement of only one charge-carrier type in an artificial nucleus. Binding energies of excitons, trions, and biexcitons in these nanostructures are then effectively ionization energies of these artificial atoms. The binding energies reported here are calculated within the effective-mass approximation using the diffusion quantum Monte Carlo method and realistic geometries for gallium antimonide rings in gallium arsenide. The electrons form a halo outside the ring, with very little charge density inside the central cavity of the ring. The de-excitonization and binding energies of the complexes are relatively independent of the precise shape of the ring.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review B: Condensed Matter and Materials Physics
ID Code:
131862
Deposited By:
Deposited On:
12 Mar 2019 08:55
Refereed?:
Yes
Published?:
Published
Last Modified:
22 Nov 2020 06:20