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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.

Original publication

DOI

10.1103/PhysRevLett.95.017403

Type

Journal article

Journal

Phys Rev Lett

Publication Date

01/07/2005

Volume

95