Plasmon modes of spatially separated double-layer graphene

被引：187

作者：

Hwang, E. H. ^{[1
]}

Das Sarma, S. ^{[1
]}

机构：

[1] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 20期

关键词：

DOUBLE-QUANTUM-WELL; COLLECTIVE MODES; COULOMB DRAG; ELECTRON-GAS; EXCITATIONS; SYSTEMS; BILAYER;

D O I：

10.1103/PhysRevB.80.205405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We derive the plasmon dispersion in doped double-layer graphene (DLG), made of two parallel graphene monolayers with carrier densities n(1) and n(2), respectively, and an interlayer separation of d. The linear chiral gapless single-particle energy dispersion of graphene leads to DLG plasmon properties with several unexpected experimentally observable characteristic features such as a nontrivial influence of an undoped (n(2)=0) layer on the DLG plasmon dispersion and a strange influence of the second layer even in the weak-coupling d ->infinity limit. At long wavelengths (q -> 0), the density dependence of the plasma frequencies is different from the usual two-dimensional (2D) electron system with quadratic energy dispersion. Our predicted DLG plasmon properties clearly distinguish graphene from the extensively studied usual parabolic 2D electron systems.

引用

页数：5

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