A two-photon excitation difference frequency generation technique directly measures coherence times of dipole-forbidden excitons in Cu2O, finding 3 ns for the 1S orthoexciton and few-picosecond dephasing for higher Rydberg states.
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Coherence of dipole-forbidden Rydberg excitons in Cu$_2$O measured by polarization- and time-resolved multi-photon spectroscopy
A two-photon excitation difference frequency generation technique directly measures coherence times of dipole-forbidden excitons in Cu2O, finding 3 ns for the 1S orthoexciton and few-picosecond dephasing for higher Rydberg states.