Temperature and layer number dependence of the G and 2D phonon energy and damping in graphene

Journal of Physics. Condensed Matter : an Institute of Physics Journal
A T ApostolovJ M Wesselinowa

Abstract

We have studied the temperature and size dependence of the G and 2D phonon modes in graphene. It is shown that in a graphene monolayer the phonon energy decreases whereas the phonon damping increases with increasing temperature. The electron-phonon interaction leads to hardening whereas the fourth-order anharmonic phonon-phonon processes lead to softening of the phonon energy with increasing temperature. We have shown that the electron-phonon interaction plays an important role also by the dispersion dependence of the phonon G mode, by the observation of the Kohn anomaly. The G mode frequency decreases and damping increases, whereas the 2D phonon frequency and damping increase with increasing layer number. The temperature and size effects of the 2D mode are much stronger than those of the G mode.

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Citations

Jan 24, 2018·Nature Communications·C FerranteT Scopigno
Oct 1, 2020·Nanoscale Research Letters·Mingming YangXiaohui Zhao

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