Dynamics of in-plane charge separation front in 2D electron-hole gas

Details Dynamics of in-plane charge separation front in 2D electron-hole gas Dynamics of in-plane charge separation front in 2D electron-hole gas

2004-12-10

arxiv.org/abs/cond-mat/0412272v1

Physics

Condensed Matter

Other Condensed Matter

13 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.041301

We show both experimentally and theoretically that the recently observed optically induced in-plane charge separation in quantum well (QW) structures and the exciton ring emission pattern at this charge separation boundary have an extremely long lifetime. The oppositely charged carriers remain separated and provide a reservoir of excitons at their boundary with a persistent emission which lasts hundreds of microseconds (orders of magnitude longer than their recombination time) after the external excitation is removed. This long lifetime is due to an interplay between the slow in-plane carrier diffusion and slow carrier tunnelling perpendicular to the QW plane.

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