Premium
Anomalously fast decay of the LH–HH exciton Raman coherence
Author(s) -
Borca C. N.,
VanEngen Spivey Amelia G.,
Cundiff Steven T.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200303179
Subject(s) - coherence (philosophical gambling strategy) , raman scattering , raman spectroscopy , exciton , physics , coherence time , quantum beats , four wave mixing , atomic physics , scattering , mixing (physics) , transient (computer programming) , quantum , molecular physics , quantum mechanics , nonlinear optics , laser , computer science , operating system
We perform 3‐pulse transient four‐wave‐mixing on a GaAs/AlGaAs multiple quantum well. This allows us to measure both the decay of the Raman coherence between the heavy‐hole and light‐hole excitons and the decay of the respective optical coherences. We observe that the decay rate of the Raman coherence is greater than the sum of decay rates of the optical coherences. This cannot happen within a Markov approximation for the scattering processes, as verified by simulations. The simulations show that such behavior can occur only in the presence of anti‐correlated scattering processes in a non‐Markovian regime.