Title
Correlation Coefficient For Dephasing Of Light-hole Excitons And Heavy-hole Excitons In Gaas Quantum Wells
Document Type
Article
Publication Date
2-1-2008
Publication Title
Solid State Communications
Department
Physics
Abstract
Dephasing of light-hole (LH) and heavy-hole (HH) excitons and of the non-radiative LH-HH exciton Raman coherence in weakly-disordered GaAs quantum wells is probed using three-beam transient four-wave mixing (TFWM). By varying the two inter-pulse delays independently, the radiative inter-band and non-radiative intra-band coherences can be probed independently. A theoretical model based on the density matrix and including inhomogeneous broadening and inhomogeneous dephasing rates is fit to the TFWM data to extract the dephasing rates. The dephasing rate of the LH-HH Raman coherence can be expressed as a function of the dephasing rates of the LH and HH excitons and a correlation coefficient, R-ph, allowing for the calculation of R-ph. We find R-ph < 0, suggesting that anti-correlated scattering dominates the exciton dephasing.
Volume
145
Issue
56
pp.
303-307
ISSN
0038-1098
Citation
Spivey, Amelia G. Vanengen, Camelia N. Borca, and Steven T. Cundiff. 2008. "Correlation coefficient for dephasing of light-hole excitons and heavy-hole excitons in GaAs quantum wells." Solid State Communications 145(5-6): 303-307.