Emission Dynamics of Rydberg Excitons in $\mathrm{C}{\mathrm{u}}_2\mathrm{O}$: Distinguishing Second Harmonic Generation from Secondary Emission

Kerwan Morin, Poulab Chakrabarti, Delphine Lagarde +5

Rydberg excitons in $\mathrm{C}{\mathrm{u}}_2\mathrm{O}$ simultaneously give rise to two very different optical responses under resonant two-photon excitation: a coherent second-harmonic signal mediat…