Ising instability of a Holstein phonon mode in graphene

K. Ziegler; E. Kogan; E. Majerníková; S. Shpyrko

doi:10.1103/PhysRevB.84.073407

Ising instability of a Holstein phonon mode in graphene

K. Ziegler, E. Kogan, E. Majerníková, S. Shpyrko

Department of Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We study the thermal distribution of phonons in a honeycomb lattice. Due to the two electronic bands there are two out-of-plane phonon modes with respect to the two sublattices. One of these modes undergoes an Ising transition by spontaneously breaking the sublattice symmetry. We calculate the critical point, the renormalization of the phonon frequency and the average lattice distortion. This transition might be observable in doped graphene by Raman scattering and transport experiments.

Original language	English
Article number	073407
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	84
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevB.84.073407
State	Published - 22 Aug 2011

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10.1103/PhysRevB.84.073407

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Ising instability of a Holstein phonon mode in graphene

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