Ring-shaped luminescence pattern in biased quantum wells studied as a steady state reaction front

Abstract

Under certain conditions, focused laser excitation in semiconductor quantum well structures can lead to charge separation and a circular reaction front, which is visible as a ring-shaped photoluminescence pattern. The diffusion-reaction equations governing the system are studied here with the aim of a detailed understanding of the steady state. The qualitative asymmetry in the sources for the two carriers is found to lead to unusual effects which dramatically affect the steady-state configuration. Analytic expressions are derived for carrier distributions and interface position for a number of cases. These are compared with steady-state information obtained from simulations of the diffusion-reaction equations.

8 pages, 5 figures; v2 improved figures and discussion

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Cited by in corpus (11)

• Kinetics of the inner ring in the exciton emission pattern in GaAs coupled quantum wells
• Kinetics of Exciton Emission Patterns and Carrier Transport
• Pattern Formation in the Exciton Inner Ring
• Thermodynamic model of the macroscopically ordered exciton state
• Drift-diffusion model of the fragmentation of the external ring structure in the photoluminescence pattern of indirect excitons in coupled quantum wells
• Theory of condensation of indirect excitons in a trap
• Fluctuation and Commensurability Effect of Exciton Density Wave
• Excitation Energy Dependence of the Exciton Inner Ring
• Ring-shaped luminescence patterns in a locally photoexcited electron-hole bilayer
• Transport of Indirect Excitons in High Magnetic Fields
• Ring-shaped spatial pattern of exciton luminescence formed due to the hot carrier transport in a locally photoexcited electron-hole bilayer