Measurement of layer breathing mode vibrations in few-layer graphene

被引：107
作者：
Lui, Chun Hung
Heinz, Tony F. [1 ]
机构：
[1] Columbia Univ, Dept Phys, New York, NY 10027 USA
来源：
PHYSICAL REVIEW B | 2013年 / 87卷 / 12期
关键词：
PHONON;
D O I：
10.1103/PhysRevB.87.121404
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Layer-layer coupling plays a critical role in defining the physical properties of few-layer graphene. With respect to vibrations, for each layer thickness N, interlayer coupling creates a set of N - 1 out-of-plane layer breathing modes (ZO') with finite frequencies at the zone center. Unlike the widely studied intralayer vibrations, the properties of these layer breathing modes (LBMs) are defined by the layer-layer interactions. Here we report the observation of distinct LBMs for Bernal stacked graphene of layer thicknesses N = 2-20 through measurement of electronically resonant overtone Raman bands. The Raman bands exhibit multipeak features that are unique for graphene samples of each layer thickness. The frequencies can be described well using a simple linear-chain model based on nearest-neighbor couplings between the layers. DOI: 10.1103/PhysRevB.87.121404
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页数：7
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