We report Raman-scattering measurements of BaC6, SrC6, YbC6, and CaC6, which permit a systematic study of the phonons and the electron-phonon interaction within the doped graphene layers of these compounds. The out-of-plane carbon phonon softens as the spacing of the graphene layers is reduced in the series BaC6, SrC6, YbC6, and CaC6. This is due to increasing charge in the pi* electronic band. Electron-phonon interaction effects between the in-plane carbon modes at approximate to 1500 cm(-1) and the pi* electrons cause a strong nonadiabatic renormalization. As charge is transferred into the pi* band, these nonadiabatic effects are found to increase concurrent with a reduction in the phonon lifetime
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Titolo: | Nonadiabatic phonons within the doped graphene layers of XC6 compounds |
Autori: | |
Data di pubblicazione: | 2010 |
Rivista: | |
Abstract: | We report Raman-scattering measurements of BaC6, SrC6, YbC6, and CaC6, which permit a systematic study of the phonons and the electron-phonon interaction within the doped graphene layers of these compounds. The out-of-plane carbon phonon softens as the spacing of the graphene layers is reduced in the series BaC6, SrC6, YbC6, and CaC6. This is due to increasing charge in the pi* electronic band. Electron-phonon interaction effects between the in-plane carbon modes at approximate to 1500 cm(-1) and the pi* electrons cause a strong nonadiabatic renormalization. As charge is transferred into the pi* band, these nonadiabatic effects are found to increase concurrent with a reduction in the phonon lifetime |
Handle: | http://hdl.handle.net/11582/22309 |
Appare nelle tipologie: | 1.1 Articolo in rivista |