Charge Separation of Dense Two-Dimensional Electron-Hole Gases: Mechanism for Exciton Ring Pattern Formation

R. Rapaport*, Gang Chen, D. Snoke, Steven H. Simon, Loren Pfeiffer, Ken West, Y. Liu, S. Denev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

132 Scopus citations

Abstract

An experiment conducted to resolve the puzzling observation of large diameter exciton emission halos around a laser excitation spot in two dimensional systems was discussed. The ring emission persisted for an extremely long time compared to the center spot lifetime after the laser excitation was turned off due to the macroscopic charge separation. The ring time was determined by a slow carrier diffusion, driven by the carrier density gradients in the plane and the center spot lifetime was determined by the free carrier recombination time. The charge separation dwell in the charge reservoirs allowed for cooling of initially hot optically generated carriers.

Original languageAmerican English
Article number117405
Pages (from-to)117405-1-117405-4
JournalPhysical Review Letters
Volume92
Issue number11
DOIs
StatePublished - 19 Mar 2004
Externally publishedYes

Bibliographical note

Funding Information:
This work has been partially supported by the National Science Foundation and the Department of Energy. We thank Phil Platzman, Girsh Blumberg, Nikolai Zhitenev, Rafi de Picciotto, Chandra Varma, and Peter Littlewood for helpful discussions.

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