Dynamical response functions and collective modes of bilayer graphene

被引：56

作者：

Borghi, Giovanni ^{[1
]}

Polini, Marco ^{[2
,3
]}

Asgari, Reza ^{[4
]}

MacDonald, A. H. ^{[5
]}

机构：

[1] SISSA, Int Sch Adv Studies, I-34014 Trieste, Italy

[2] NEST CNR INFM, I-56126 Pisa, Italy

[3] Scuola Normale Super Pisa, I-56126 Pisa, Italy

[4] IPM, Inst Res Fundamental Sci, Sch Phys, Tehran 193955531, Iran

[5] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 24期

关键词：

doping; electronic structure; energy gap; graphene;

D O I：

10.1103/PhysRevB.80.241402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bilayer graphene (BLG) has recently attracted a great deal of attention because of its electrically tunable energy gaps and its unusual electronic structure. In this Rapid Communication we present analytical and semianalytical expressions, based on the four-band continuum model, for the layer-sum and layer-difference density-response functions of neutral and doped BLG. These results demonstrate that BLG density fluctuations can exhibit either single-component massive-chiral character or standard two-layer character, depending on energy and doping.

引用

页数：4

共 25 条

[1] Theory of the pseudospin resonance in semiconductor bilayers [J].