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Time resolved measurements provide a new way to disentangle complexinteractions in quantum materials due to their different timescales. We usedpump-probe Raman scattering to investigate the apical oxygen vibration inYBa$_2$Cu$_3$O$_{6+x}$ under nonequilibrium conditions. Time-dependence of thephonon population demonstrated strong electron-phonon coupling. Mostimportantly, the phonon shifts to a higher energy due to transient smearing ofthe Fermi surface in a remarkable agreement with diagrammatic theory. We alsodiscuss new insights into photoinduced superconductivity reported at lowerdoping that follow from these results.

Relaxation timescales and electron-phonon coupling in optically-pumped YBa$_2$Cu$_3$O$_{6+x}$ revealed by time-resolved Raman scattering