Raman spectroscopy of twisted bilayer graphene

被引：93

作者：

Jorio, Ado ^{[1
,2
]}

Cancado, Luiz Gustavo ^{[1
,3
]}

机构：

[1] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

[2] ETH, Photon Lab, CH-8093 Zurich, Switzerland

[3] Inst Nacl Metrol Qualidade & Tecnol INMETRO, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, Brazil

来源：

SOLID STATE COMMUNICATIONS | 2013年 / 175卷

关键词：

Twisted bilayer graphene; van Hove singularities; Phonon dispersion; Raman spectroscopy; CARBON NANOTUBES; SCATTERING; GRAPHITE; SUPERLATTICES; FILMS;

D O I：

10.1016/j.ssc.2013.08.008

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Twisted bilayer graphene (tBLG) is a two-graphene layers system with a mismatch angle theta between the two hexagonal structures. The interference between the two rotated layers generates a superlattice with a theta-dependent wavevector that gives rise to van Hove singularities in the electronic density of states and activates phonons in the interior of the graphene Brillouin zone. Here we review the use of Raman spectroscopy to study tBLG, exploring the theta-dependent effects, corroborated by independent microscopy analysis. The phonon frequencies give a Raman signature of the specific tBLG, while their linewidths provide a straightforward test for tBLG structural homogeneity. Rich resonance effects, including single and multiple-resonances, intra- and inter-valley scattering events make it possible to accurately measure the energy of superlattice-induced van Hove singularities in the electronic joint density of states, as well as the phonon dispersion relation in tBLG, including the layer breathing vibrational modes. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：3 / 12

页数：10

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