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

doi:10.1103/PhysRevLett.92.117405

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 journal › Article › peer-review

134 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 language	English
Article number	117405
Pages (from-to)	117405-1-117405-4
Journal	Physical Review Letters
Volume	92
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.92.117405
State	Published - 19 Mar 2004
Externally published	Yes

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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10.1103/PhysRevLett.92.117405

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

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.",

author = "R. Rapaport and Gang Chen and D. Snoke and Simon, {Steven H.} and Loren Pfeiffer and Ken West and Y. Liu and S. Denev",

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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AU - Simon, Steven H.

AU - Pfeiffer, Loren

AU - West, Ken

AU - Liu, Y.

AU - Denev, S.

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

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