Fig. 2: The total (real part) 2D electronic spectra acquired at room temperature for varying waiting times, T. | Communications Physics

Fig. 2: The total (real part) 2D electronic spectra acquired at room temperature for varying waiting times, T.

From: Ultrafast exciton-phonon coupling and energy transfer dynamics in quasi-2D layered Ruddlesden-Popper perovskites

Fig. 2

The spectra are plotted with the x-axis(ωt) representing the probe frequency and the y-axis(ωτ) corresponding to the excitation frequency, providing a detailed depiction of the spectral features as a function of temporal evolution, which τ and t represent the first and third period of time. Ground-state bleach and stimulated emission are shown in red, while excited-state absorption is represented in blue. The experiment utilized a 12-fs laser pulse. Dashed lines in the 2D spectrum at T = 30 fs highlight the excitonic transition energies for various 2D perovskite layers. Diagonal excitonic bleach peaks, labeled A, B, C, and D, correspond to 2D layers with n = 2, 3, 4, and 5, respectively. Excitonic coupling peaks, labeled AB, BC, and CD, represent the interactions between these transitions.

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