Ultrafast dynamics of vibronically dressed core excitons in graphite: a femtosecond RIXS perspective.

ABSTRACT: Time-resolved resonant inelastic X-ray scattering (tr-RIXS) is a powerful technique for probing quasiparticle interactions in quantum materials under nonequilibrium conditions. Here, we implement tr-RIXS at the carbon K-edge to investigate the ultrafast dynamics of core excitons coupled to vibrational modes in graphite. Using femtosecond X-ray pulses from a free-electron laser, we monitor the temporal evolution of vibronically dressed excitons and their interaction with symmetry-selective optical phonons. By tuning the incident photon energy across the 1s → σ^* resonance and analyzing the integrated inelastic sideband intensity, we reveal a detuning-controlled crossover between two complementary dynamical regimes. Phenomenological modeling and first-principles calculations reprod

SUBMITTER: Malvestuto M 

PROVIDER: S-EPMC12859033 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature