Dynamics of the in-plane charge separation front in a two-dimensional electron-hole gas

Gang Chen, Ronen Rapaport, Steven H. Simon, Loren Pfeiffer, Ken West

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

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 tunneling perpendicular to the QW plane.

Original languageEnglish (US)
Article number041301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number4
DOIs
StatePublished - Jan 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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