Fig. 4: Reduction in amplitudes of resonant vibrational modes in the coherence spectra and absence of the resonant mode in the dynamical Stokes shift spectra of the rAPC trimer. | Nature Communications

Fig. 4: Reduction in amplitudes of resonant vibrational modes in the coherence spectra and absence of the resonant mode in the dynamical Stokes shift spectra of the rAPC trimer.

From: Quantum phase synchronization via exciton-vibrational energy dissipation sustains long-lived coherence in photosynthetic antennas

Fig. 4

a Comparison of the integrated coherence spectra between the \(\alpha\)-subunit (green) and trimer (orange) from 2DES (top) and heterodyne-detected transient grating (HDTG, bottom) measurements. HDTG measurements were obtained with a broader excitation spectrum. The background noise level of 2DES(HDTG)-detected coherence spectrum was about 15% (19%) of the integrated FT spectrum maximum. b Coherence spectra of dynamical Stokes shift measured via 2DES (top) and broadband transient absorption (BBTA, bottom) with the same excitation spectrum. The background noise level of 2DES(BBTA)-detected coherence spectrum was about 12% (4%) of the FT spectrum maximum. The gray lines indicate vibrational modes observed in both spectra: 200, 270, 465, 515, 660, 805, 880, 1240, 1380, 1580, and 1640 cm−1. The orange-shaded area shows the near-resonant frequency region in the trimer. All spectra were normalized to the amplitude at 200 cm−1. Source data are provided as a Source Data file.

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