Dean, Mark P. M., Howard, Christopher A., Saxena, Siddharth S. and Ellerby, Mark (2010) Nonadiabatic phonons within the doped graphene layers of XC6 compounds. Physical Review B, 81 (4).
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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.
This is a Submitted version This version's date is: 1/2010 This item is not peer reviewed
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