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  • Hodgson JAP 119 044305 (2016)

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GaSb quantum rings in GaAs/AlxGa1−xAs quantum wells

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number044305
<mark>Journal publication date</mark>28/01/2016
<mark>Journal</mark>Journal of Applied Physics
Issue number4
Number of pages7
Publication StatusPublished
<mark>Original language</mark>English


We report the results of continuous and time-resolved photoluminescence measurements on type-II GaSb quantum rings embedded within GaAs/AlxGa1-xAs quantum wells. A range of samples were grown with different well widths, compensation-doping concentrations within the wells, and number of quantum-ring layers. We find that each of these variants have no discernible effect on the radiative recombination, except for the very narrowest (5 nm) quantum well. In contrast, singleparticle numerical simulations of the sample predict changes in photoluminescence energy of up to 200 meV. This remarkable difference is explained by the strong Coulomb binding of electrons to rings that are multiply charged with holes. The resilience of the emission to compensation doping indicates that multiple hole occupancy of the quantum rings is required for efficient carrier recombination, regardless of whether these holes come from doping or excitation.