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arXiv · 0906.3609

Non-adiabatic phonons within the doped graphene layers of XC$_6$ compounds

Mark P. M. Dean·Christopher A. Howard·Siddharth S. Saxena·Mark Ellerby
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Abstract

We report the first Raman scattering measurements of BaC$_6$, SrC$_6$, and YbC$_6$, which along with new data on CaC$_6$, permits 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 BaC$_6$, SrC$_6$, YbC$_6$, and CaC$_6$. This is due to increasing charge in the $π^*$ electronic band. Electron-phonon interaction effects between the in-plane carbon modes at $\approx1500$\invcm and the $π^*$ electrons cause a strong non-adiabatic renormalization. As charge is transferred into the $π^*$ band these non-adiabatic effects are found to increase concurrent with a reduction in the phonon lifetime.

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Mark P. M. Dean, Christopher A. Howard, Siddharth S. Saxena, Mark Ellerby. 2010-06-05. Non-adiabatic phonons within the doped graphene layers of XC$_6$ compounds. https://doi.org/10.1103/physrevb.81.045405

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