Electronic compressibility of graphene: The case of vanishing electron correlations and the role of chirality

被引：24

作者：

Abergel, D. S. L. ^{[1
]}

Pietilainen, Pekka ^{[2
]}

Chakraborty, Tapash ^{[1
]}

机构：

[1] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

[2] Univ Oulu, Dept Phys Sci Theoret Phys, FIN-90014 Oulu, Finland

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 08期

基金：

加拿大自然科学与工程研究理事会;

关键词：

band structure; chirality; electron correlations; graphene; monolayers; 2-DIMENSIONAL ELECTRON; BILAYER GRAPHENE; GAS; ENERGY; STATE;

D O I：

10.1103/PhysRevB.80.081408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A recent surprising finding that electronic compressibility measured experimentally in monolayer graphene can be described solely in terms of the kinetic energy [J. Martin , Nat. Phys. 4, 144 (2008)] is explained theoretically as a direct consequence of the linear energy dispersion and the chirality of massless Dirac electrons. For bilayer graphene we show that contributions to the compressibility from the electron correlations are restored. We attribute the difference to the respective momentum dependence of the low-energy-band structures of the two materials.

引用

页数：4

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