Fig. 3: The long-lived coherence in the dynamical Stokes shift of the rAPC trimer.

The dynamical Stokes shift of the diagonal peaks at 15300 cm⁻¹ in the lower excitonic level of the trimer (orange line in a) and at 16000 cm⁻¹ in the α-subunit (light green line in b) are detected via two-dimensional electronic spectroscopy (2DES). The energy relaxation kinetics are fitted with the sum of a Gaussian and damped sine function mentioned in the main text. The fitting results (red lines in a and dark green lines in b) comprising the Gaussian decay component and the oscillation component are superimposed on the original kinetics (top) and oscillatory residual curves (bottom) for each panel. The damped oscillation decay (\({\tau }_{c}\)) time constants indicated on the curves reveal the dephasing of coherence. Source data are provided as a Source Data file.