Screening, Kohn Anomaly, Friedel Oscillation, and RKKY Interaction in Bilayer Graphene

被引：147

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 LETTERS | 2008年 / 101卷 / 15期

关键词：

Bilayer Graphene - Friedel oscillations - Kohn anomalies - Random phase approximations - RKKY interactions - Screening functions - Single layer;

D O I：

10.1103/PhysRevLett.101.156802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the screening function in bilayer graphene (BLG) in both the intrinsic (undoped) and the extrinsic (doped) regimes within the random phase approximation, comparing our results with the corresponding single layer graphene and the regular two-dimensional electron gas. We find that the Kohn anomaly is strongly enhanced in BLG. We also discuss the Friedel oscillation and the RKKY interaction, which are associated with the nonanalytic behavior of the screening function at q=2k(F). We find that the Kohn anomaly, the Friedel oscillation, and the RKKY interaction are all qualitatively different in the BLG compared with the single layer graphene and the two-dimensional electron gas.

引用

页数：4

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