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research article

Resonant Rayleigh scattering dynamics of excitons in single quantum wells

Langbein, W.
•
Woggon, U.
•
Savona, V.  
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2003
Physical Review B

The resonant Rayleigh scattering dynamics of excitons in single GaAs quantum wells is investigated. The deviation of the measured intensity from the ideal ensemble average is analyzed as a function of the speckle ensemble size. The influence of the amplitude and correlation length of the exciton disorder potential is traced using a series of samples with varying inhomogeneous broadening and interface island sizes. The experimental data are compared with theoretical predictions using exciton states of spatially uncorrelated energies, as well as full calculations of the exciton polarization dynamics using a more realistic disorder potential including the formation of monolayer islands. Deviations from the dynamics of uncorrelated states are found at early times after excitation. They are reproduced by the calculations possessing a state correlation due to quantum mechanical level repulsion and a finite correlation length for the disorder potential. Additionally, the presence of a long-range disorder potential in the micrometer range is suggested. Changing the disorder potential by varying the island size influences the observed dynamics systematically according to the different disorder correlation lengths.

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Type
research article
DOI
10.1103/PhysRevB.68.085207
Web of Science ID

WOS:000185287500029

Author(s)
Langbein, W.
Woggon, U.
Savona, V.  
Zimmermann, R.
Reuter, D.
Wieck, A.D.
Kocherscheidt, G.
Date Issued

2003

Published in
Physical Review B
Volume

68

Issue

8

Article Number

085207

Subjects

Resolved Speckle Analysis

•

Interface Roughness

•

Secondary-Emission

•

System

•

Nanostructures

•

Luminescence

•

Coherence

•

Disorder

•

States

•

Gaas

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/20.500.14299/42827
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