This work shows that atomic-scale alloy randomness alone can activate and reshape dark-exciton optical signatures in nominally symmetric self-assembled quantum dots. It links dark-exciton visibility directly to microscopic alloy configuration.
Keywords: self-assembled quantum dots
Main result: alloy randomness can strongly enhance and modify darkâbright exciton mixing without requiring deliberate faceting or elongation. Dark-exciton properties in alloyed dots are therefore intrinsically sample-specific.