Faculty Publications

Title

Stacking-dependent shear modes in trilayer graphene

Document Type

Article

Journal/Book/Conference Title

Applied Physics Letters

Volume

106

Issue

4

Abstract

We observe distinct interlayer shear mode Raman spectra for trilayer graphene with ABA and ABC stacking order. There are two rigid-plane shear-mode phonon branches in trilayer graphene. We find that ABA trilayers exhibit pronounced Raman response from the high-frequency shear branch, without any noticeable response from the low-frequency branch. In contrast, ABC trilayers exhibit no response from the high-frequency shear branch, but significant Raman response from the low-frequency branch. Such complementary behaviors of Raman shear modes can be explained by the distinct symmetry of the two trilayer allotropes. The strong stacking-order dependence is not found in the layer-breathing modes, and thus represents a unique characteristic of the shear modes.

Original Publication Date

1-26-2015

DOI of published version

10.1063/1.4906579

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