Electron-Phonon Coupling in Silicene

ORAL

Abstract

We report here a first-principles study of the electron-phonon coupling (EPC) in silicene and compare the results to graphene. The $E_g$ mode at $\Gamma$ and the $A_1$ mode at $K$ of the first Brillouin zone are shown to exhibit Kohn anomalies, similar to that in graphene. Detailed calculations show that although the EPC matrix elements are much smaller than in graphene, the linear band with smaller slope compensate this effect, resulting in a slightly larger phonon linewidth. Finally, the phonon frequency shift and the linewidth of the $E_g$ mode as a function of the Fermi level $E_F$ have been calculated.

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Authors

  • Jia-An Yan

    Department of Physics, Astronomy, and Geosciences, Towson University, 8000 York Road, Towson, MD 21252 USA, Department of Physics, Astronomy, and Geosciences

  • Mei-Yin Chou

    Insitute of Atomic and Molecular Science, Academia Sinica, Taipei, Taiwan and Georgia Institute of Technology, Atlanta, Georgia, USA, School of Physics, Georgia Institute of Technology, Atlanta 30332, USA, and IAMS, Academia Sinica, Taipei, Taiwan, School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipe