Dielectric function and plasmons in graphene

被引：78

作者：

Hill, A. ^{[1
]}

Mikhailov, S. A. ^{[1
]}

Ziegler, K. ^{[1
]}

机构：

[1] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany

来源：

EPL | 2009年 / 87卷 / 02期

关键词：

INTERCALATED GRAPHITE; GAS;

D O I：

10.1209/0295-5075/87/27005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electromagnetic response of graphene and the spectrum of collective plasmon excitations are studied as a function of wave vector and frequency. Our calculation is based on the tight-binding band structure, including both valleys. As a result, near the Dirac points we find plasmons whose dispersion is similar to that obtained in the single-valley approximation by Dirac fermions with some anisotropy though. In contrast to the calculation for a single Dirac cone, we find a stronger damping of the plasmon modes due to interband absorption. Our calculation also reveals effects due to deviations from the linear Dirac spectrum as we increase the Fermi energy, indicating an anisotropic behavior with respect to the wave vector of the external electromagnetic field. Copyright (C) EPLA, 2009

引用

页数：5

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