The reflection dynamics of a subpicosecond optical pulse was investigated under the Brewster angle of incidence at the exciton resonance in the layered compounds GaSe. The reflected pulse has a tail of a few picosecond which allows the decay of the resonant polarization. A time oscillatory decay of the transient reflectivity was observed. This behavior can be explained by quantum beats in the polarization decay of coherently excited singlet and triplet excitons.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics