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

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

2005-07-03

arxiv.org/abs/cond-mat/0507058v2

Phys. Rev. E 73, 066207 (2006).

Physics

Condensed Matter

Statistical Mechanics

8 pages, 5 figures; v2 improved figures and discussion

Scientific paper

10.1103/PhysRevE.73.066207

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.

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