The shear mode of multilayer graphene
The shear mode of multilayer graphene
复制标题
多层石墨烯的剪切模式
DOI：
10.1038/nmat3245
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发表时间：
2012-04-01
期刊：
影响因子：
41.2
通讯作者：
Ferrari, A. C.
中科院分区：
文献类型：
--
作者：
Tan, P. H.;Han, W. P.;Ferrari, A. C.
对能够实现下一代电子和光子器件的材料的追求继续推动对石墨烯的电子，光学和振动特性的研究。每层少于十层的少层石墨烯（FLG）薄片显示出独特的能带结构。因此，人们对FLG的物理和应用越来越感兴趣。拉曼光谱是探测石墨烯样品的最有用和最通用的工具之一。在这里，我们揭示了层间剪切模式的FLG，从双层石墨烯（BLG）的块状石墨，并建议相应的拉曼峰测量层间耦合。该峰从块状石墨中的类似于43 cm（-1）缩放到BLG中的类似于31 cm（-1）。它的低能量使其对近狄拉克点准粒子敏感。类似的剪切模式，预计在所有的层状材料，提供了一个直接的探针层间相互作用。
The quest for materials capable of realizing the next generation of electronic and photonic devices continues to fuel research on the electronic, optical and vibrational properties of graphene. Few-layer graphene (FLG) flakes with less than ten layers each show a distinctive band structure. Thus, there is an increasing interest in the physics and applications of FLGs. Raman spectroscopy is one of the most useful and versatile tools to probe graphene samples. Here, we uncover the interlayer shear mode of FLGs, ranging from bilayer graphene (BLG) to bulk graphite, and suggest that the corresponding Raman peak measures the interlayer coupling. This peak scales from similar to 43 cm(-1) in bulk graphite to similar to 31 cm(-1) in BLG. Its low energy makes it sensitive to near-Dirac point quasiparticles. Similar shear modes are expected in all layered materials, providing a direct probe of interlayer interactions.