Electronic structure and optical properties of twisted multilayer graphene

被引：32

作者：

Vela, Adriana ^{[1
]}

Moutinho, M. V. O. ^{[2
,3
]}

Culchac, F. J. ^{[1
]}

Venezuela, P. ^{[3
]}

Capaz, Rodrigo B. ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ, Brazil

[2] Univ Fed Rio de Janeiro, Nucleo Multidisciplinar Pesquisas Comp NUMPEX COM, Campus Duque de Caxias, BR-25245390 Duque De Caxias, RJ, Brazil

[3] Univ Fed Fluminense, Inst Fis, BR-24210346 Niteroi, RJ, Brazil

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 15期

关键词：

VAN-HOVE SINGULARITIES; BILAYER GRAPHENE; SUPERLATTICES; SUPERCONDUCTIVITY; MECHANISM;

D O I：

10.1103/PhysRevB.98.155135

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the electronic and optical properties of twisted trilayer and tetralayer graphene structures using a combination of tight-binding and density-functional theory methods. Band structures, densities of states, and optical absorption spectra are calculated for a variety of layer stackings and twisting angles. Systematic trends of all properties are obtained and compared to the more well known case of twisted bilayer graphene. For trilayer and tetralayer structures, we find, respectively, two and three well-defined absorption peaks in the infrared/visible range that shift with twisting angle, in contrast to the single peak observed in bilayer graphene. In addition, systems containing Bernal-stacked layers present an extra peak in the infrared which is related to transitions between parabolic bands and does not shift with twisting angle. The observed trends may be used to identify the twisting angle and the number of layers in multilayer graphene samples. In particular, magic angles are predicted for the trilayer and tetralayer structures.

引用

页数：9

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