Fig. 1: Schematic illustration of phonon-mediated intervalley scattering processes and experimental ultrafast pump-probe detection of monolayer MoSe2. | Nature Communications

Fig. 1: Schematic illustration of phonon-mediated intervalley scattering processes and experimental ultrafast pump-probe detection of monolayer MoSe2.

From: K-point longitudinal acoustic phonons are responsible for ultrafast intervalley scattering in monolayer MoSe2

Fig. 1

a The atomic structure of transition metal dichalcogenides (TMDCs) and valley scattering processes mediated by XA(K) and XA(M) phonons (XA: LA, TA, and ZA). b Schematic illustration of the pump-probe detection of the ultrafast optical response of monolayer MoSe2 modulated by coherent phonon generation. c The experimental differential transmittance (upper panel) and its Fourier-transformed spectrum (lower panel) exhibiting coherent phonon signals in first-order A1′(Γ) mode and first- and higher orders of the LA mode. d The calculated phonon dispersion of monolayer MoSe2 obtained by density-functional theory. The A1′(Γ), LA(M), and LA(K) modes observed at 7.33, 4.75, and 4.79 THz are highlighted.

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