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

Article

关键词: COUPLED QUANTUM-WELLS;    TRANSPORT;    CONDENSATION;   

DOI  :  10.1103/PhysRevB.81.193403

来源: SCIE

【 摘 要 】

We report the results of molecular-dynamics simulation of a spatiotemporal evolution of the locally photo-excited electrons and holes localized in two separate layers. It is shown that the ring-shaped luminescence pattern forms due to the strong in-layer Coulomb interaction at high photoexcitation power. In addition, the results predict (i) stationary spatial oscillations of 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.

【 授权许可】

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