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  4. Theory of time-resolved light emission from polaritons in a semiconductor microcavity under resonant excitation
 
research article

Theory of time-resolved light emission from polaritons in a semiconductor microcavity under resonant excitation

Weisbuch, C.
•
Savona, V.  
1996
Physical Review B

We develop a quantum mechanical model for the interaction of excitons in a microcavity embedded quantum well with a short resonant laser pulse. The model assumes full in-plane coherence. A Gaussian distribution of exciton slates is included in order to take into account the exciton inhomogeneous broadening. A coupling with a classical electromagnetic held provides the initial excitation pulse, and the time dependent emitted signal is calculated. Very good agreement with the recent results of time-resolved light emission under femtosecond resonant excitation by Norris et al. is obtained. We show that, in the strong coupling regime, the Rabi oscillations provide an energy transfer mechanism between the inhomogeneously broadened exciton levels, not present in the weak coupling regime or in the case of bare quantum;wells, which explains the very fast decay time of the measured signal. This mechanism is considerably faster than the scattering of excitons due to interface roughness. Consequently, the in-plane wave vector is conserved in the polariton dynamics.

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Type
research article
DOI
10.1103/PhysRevB.54.10835
Web of Science ID

WOS:A1996VT67400088

Author(s)
Weisbuch, C.
Savona, V.  
Date Issued

1996

Published in
Physical Review B
Volume

54

Start page

10835

End page

10840

Subjects

Quantum-Well Structures

•

Excitons

•

Dispersion

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTPN  
Available on Infoscience
September 22, 2009
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/42863
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