Graphite under uniaxial compression along c-axis: a new parameter relates out-of-plane strain to in-plane phonon frequency

Abstract

Stacking graphene sheets forms graphite. Two in-plane vibrational modes of graphite, E1u and E2g(2), are derived from graphene E2g mode, the shifts of which under compression are all considered as results of in-plane bond shortening. Values of Gruneisen parameter have been reported to quantify such relation. However, the reason why the shift rates of these three modes with pressure differ is unclear. In this work, we introduce a new parameter to quantify the contribution of out-of-plane strain to the in-plane vibrational frequencies, suggesting that the compression of π-electrons plays a non-negligible part in both graphite and graphene under high pressure.

8 pages, 5 figures, 1 table

References in corpus (6)

• Electric Field Effect in Atomically Thin Carbon Films
• Two Dimensional Atomic Crystals
• Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation
• Graphene under hydrostatic pressure
• The two-dimensional Brillouin zone of uniaxially strained graphene
• Pressure coefficients of Raman modes of carbon nanotubes resolved by chirality: Environmental effect on graphene sheet

Cited by in corpus (2)

• Computational study of the shift of the G band of double-walled carbon nanotubes due to interlayer interactions
• Disruption of the $s{p}^2$ bonding by the compression of the $\pi$-electronic orbitals of graphene at various stacking orders