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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
Microscopic measurement of photon echo formation in groups of individual excitonic transitions
Wolfgang Langbein1, Brian Patton
1Department of Physics and Astronomy, Cardiff University, Cardiff CF24 3YB, United Kingdom. LangbeinWW@cardiff.ac.uk
Physical Review Letters
|August 11, 2005
Abstract:
The third-order polarization emitted from groups of individual localized excitonic transitions after pulsed optical excitation is measured. We observe the evolution of the nonlinear response from the case of a free polarization decay for a single transition, to that of a photon echo for many transitions. The echo is shown to arise from the mutual rephasing of the emission from individual transitions.

