Ring-shaped luminescence patterns in a locally photoexcited electron-hole bilayer

Details Ring-shaped luminescence patterns in a locally photoexcited electron-hole bilayer Ring-shaped luminescence patterns in a locally photoexcited electron-hole bilayer

2009-09-23

arxiv.org/abs/0909.4204v3

Phys. Rev. B 81, 193403 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures. Final version as published + Erratum has been added

Scientific paper

We report the results of molecular dynamics simulation of a spatiotemporal evolution of the locally photoexcited electrons and holes localized in two separate layers. It is shown that the ring-shaped spatial pattern of luminescence forms due to the strong in-layer Coulomb interaction at high photoexcitation power. In addition, the results predict (i) stationary spatial oscillations of the electron density in quasi one-dimensional case and (ii) dynamical phase transition in the expansion of two-dimensional electron cloud when threshold electron concentration is reached. A possible reason of the oscillations and a theoretical interpretation of the transition are suggested.

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