Polarization dependence of semiconductor exciton and biexciton contributions to phase-resolved optical two-dimensional Fourier-transform spectra

TL;DR

This study investigates how polarization affects the contributions of excitons and biexcitons in phase-resolved 2DFT spectra of GaAs quantum wells, revealing polarization-dependent many-body effects and biexciton prominence.

Contribution

It provides new insights into polarization-dependent excitonic and biexcitonic interactions in quantum wells using phase-resolved 2DFT spectroscopy.

Findings

Excitonic features dominate most polarization configurations with dispersive lineshapes.

Cross-linear excitation suppresses many-body effects, weakening excitonic features.

Biexcitonic features remain strong under cross-polarized excitation.

Abstract

We study the coherent light-matter interactions of GaAs quantum wells associated with excitons, biexcitons and many-body effects. For most polarization configurations, excitonic features dominate the phase-resolved two-dimensional Fourier-transform (2DFT) spectra and have dispersive lineshapes, indicating the presence of many-body interactions. For cross-linear excitation, excitonic features become weak and absorptive due to the strong suppression of many-body effects; a result that can not be directly determined in transient four-wave mixing experiments. The biexcitonic features do not weaken for cross-polarized excitation and thus are more important.