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Experimental evidence for nonequilibrium Bose condensation of exciton polaritons

Experimental evidence for nonequilibrium Bose condensation of exciton polaritons
Experimental evidence for nonequilibrium Bose condensation of exciton polaritons
We observe dramatic changes in the near-field and far-field emission from a semiconductor microcavity excited by a pulsed and nonresonant optical pump with varying power. Above a threshold pumping power, light is emitted by a single quantum state lying at the bottom of the lower exciton-polariton band. Its intensity increases exponentially with the pump power and its linewidth becomes narrower than the cavity mode width. Near-field spectroscopy shows that the stimulated emission comes from several bright spots in the cavity plane, but no diffraction-induced angular broadening of the emission is observed. This is direct evidence for spontaneous formation of a nonequilibrium Bose condensate of coherent exciton polaritons with their wave function sharply peaked at structural imperfections.
1550-235X
201301R-[4pp]
Richard, M.
663db9af-07d3-462f-918a-1ec2a2172e48
Kasprzak, J.
945cb039-eeb6-4749-bc1f-ad2e51929ab6
Andre, R.
29b4b400-64d0-4bd2-bca7-0a92288c3b08
Romestein, R.
3b16e397-ad52-4e2d-8528-1441e06413e9
Le Si Dang, D.
7bf72217-4b07-43a4-940b-e3a4b2810548
Malpuech, G.
da5f02e8-b721-4a4b-a3fc-cb756b396e4a
Kavokin, A.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Richard, M.
663db9af-07d3-462f-918a-1ec2a2172e48
Kasprzak, J.
945cb039-eeb6-4749-bc1f-ad2e51929ab6
Andre, R.
29b4b400-64d0-4bd2-bca7-0a92288c3b08
Romestein, R.
3b16e397-ad52-4e2d-8528-1441e06413e9
Le Si Dang, D.
7bf72217-4b07-43a4-940b-e3a4b2810548
Malpuech, G.
da5f02e8-b721-4a4b-a3fc-cb756b396e4a
Kavokin, A.
70ffda66-cfab-4365-b2db-c15e4fa1116b

Richard, M., Kasprzak, J., Andre, R., Romestein, R., Le Si Dang, D., Malpuech, G. and Kavokin, A. (2005) Experimental evidence for nonequilibrium Bose condensation of exciton polaritons. Physical Review B, 72 (20), 201301R-[4pp]. (doi:10.1103/PhysRevB.72.201301).

Record type: Article

Abstract

We observe dramatic changes in the near-field and far-field emission from a semiconductor microcavity excited by a pulsed and nonresonant optical pump with varying power. Above a threshold pumping power, light is emitted by a single quantum state lying at the bottom of the lower exciton-polariton band. Its intensity increases exponentially with the pump power and its linewidth becomes narrower than the cavity mode width. Near-field spectroscopy shows that the stimulated emission comes from several bright spots in the cavity plane, but no diffraction-induced angular broadening of the emission is observed. This is direct evidence for spontaneous formation of a nonequilibrium Bose condensate of coherent exciton polaritons with their wave function sharply peaked at structural imperfections.

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Published date: 15 November 2005

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Local EPrints ID: 19258
URI: http://eprints.soton.ac.uk/id/eprint/19258
ISSN: 1550-235X
PURE UUID: 557794bf-f350-4638-9de7-79b03e9584b0

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Date deposited: 30 Jan 2006
Last modified: 15 Jul 2019 19:27

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Contributors

Author: M. Richard
Author: J. Kasprzak
Author: R. Andre
Author: R. Romestein
Author: D. Le Si Dang
Author: G. Malpuech
Author: A. Kavokin

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