Fig. 4

LA(M) phonon-induced modulation of exciton dynamics in monolayer MoSe₂. a Oscillations in the best-fit homogeneous linewidth, γ ₀, of the X⁰ resonance with the excess energy as defined in Fig. 2c. Error bars represent 99% confidence intervals of the fits. Inset: Width of inhomogeneous (Gaussian) broadening, σ. b An example of raw streak camera data for excitation centered at 1.732 eV. The trion (X⁻) and neutral exciton (X⁰) resonances are marked by dashed lines P–P' and Q−Q', respectively. Color bar: signal intensity in log-scale, arbitrary unit. c, d Time-traces of the X⁻ and X⁰ resonances, respectively, after a 2D Gaussian filter and deconvolution (Supplementary Discussion), in log-scale. The 10–90% rise-times are indicated, along with the best-fit exponential decay lifetimes, τ. Circles and red solid lines represent data points and linear fits to the exponential decay, respectively. e Lifetimes, τ, of X⁻ (crosses) and X⁰ (circles) extracted from a series of streak camera measurements with varying excitation energy. In the x-axis, similar to how the excess energy is defined, a constant X⁰ energy (1.650 eV) is subtracted from the excitation center frequency. Error bars represent standard deviations, while the dashed line serves as guide to the eye. Shaded regions indicate phonon resonances as obtained from Fig. 1b