Formation Mechanism and Low-Temperature Instability of Exciton Rings
Formation Mechanism and Low-Temperature Instability of Exciton Rings
The macroscopic rings observed in the photoluminescence patterns of excitons in coupled quantum wells are explained by a mechanism of carrier imbalance, transport, and recombination. The rings originate from the spatial separation of $p$ and $n$ carriers, and occur at the interface of the $p$ and $n$ domains, where excitons …