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- W4386875291 abstract "Ultrafast electron-phonon relaxation dynamics in graphene hides many distinct phenomena, such as hot phonon generation, dynamical Kohn anomalies, and phonon decoupling, yet still remains largely unexplored. Here, we unravel intricate mechanisms governing the vibrational relaxation and phonon dressing in graphene at a highly non-equilibrium state by means of first-principles techniques. We calculate dynamical phonon spectral functions and momentum-resolved linewidths for various stages of electron relaxation and find photo-induced phonon hardening, overall increase of relaxation rate and nonadiabaticity as well as phonon gain. Namely, the initial stage of photo-excitation is found to be governed by strong phonon anomalies of finite-momentum optical modes along with incoherent phonon production. Population inversion state, on the other hand, allows production of coherent and strongly-coupled phonon modes. Our research provides vital insights into the electron-phonon coupling phenomena in graphene, and serves as a foundation for exploring non-equilibrium phonon dressing in materials where ordered states and phase transitions can be induced by photo-excitation." @default.
- W4386875291 created "2023-09-20" @default.
- W4386875291 creator A5002958021 @default.
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- W4386875291 date "2023-09-16" @default.
- W4386875291 modified "2023-09-28" @default.
- W4386875291 title "Dynamical Phonons Following Electron Relaxation Stages in Photo-excited Graphene" @default.
- W4386875291 doi "https://doi.org/10.48550/arxiv.2309.09076" @default.
- W4386875291 hasPublicationYear "2023" @default.
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