Two-Dimensional Correlation Spectroscopy of Two-Exciton Resonances in Semiconductor Quantum Wells

Lijun Yang, Shaul Mukamel
2008 Physical Review Letters  
We propose a three-pulse coherent ultrafast optical technique that is particularly sensitive to two-exciton correlations. Two Liouville-space pathways for the density matrix contribute to this signal which reveals double quantum coherences when displayed as a two-dimensional correlation plot. Two-exciton couplings spread the cross peaks along both axes, creating a characteristic highly resolved pattern. This level of detail is not available from conventional one-dimensional four-wave mixing or
more » ... ther two-dimensional correlation spectroscopy signals such as the photo echo, in which two-exciton couplings show up along a single axis and are highly congested.
doi:10.1103/physrevlett.100.057402 pmid:18352426 fatcat:loqhzu5yjbarfju4yryfmlkqei