Spectral signatures of χ(5) processes in four-wave mixing of homogeneously broadened excitons

W. Langbein, T. Meier, S. W. Koch, J. M. Hvam

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44 Scopus citations


The influence of fifth-order coherences on the spectrally resolved four-wave mixing response of predominantly homogeneously broadened quasi-two-dimensional excitons is studied. Fifth-order signatures are discussed as a function of spectral position and excitation polarization. An exciton-biexciton beating for positive delay times is the dominant effect, which is pronounced at the exciton-biexciton transition for collinearly polarized excitation and at the exciton transition for cross-linearly polarized excitation. For negative delay times and collinearly polarized excitation a pronounced exciton-biexciton beating at the exciton resonance is observed that is vanishing for long negative delays owing to the faster dephasing in the two-exciton continuum compared with the bound biexciton state. These results are in qualitative agreement with microscopic model calculations that include the coherent dynamics of one- and two-exciton resonances up to the fifth order in the optical field.

Original languageEnglish (US)
Pages (from-to)1318-1325
Number of pages8
JournalJournal of the Optical Society of America B: Optical Physics
Issue number9
StatePublished - Sep 2001

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics


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