Ab Initio GW Many-Body Effects in Graphene

被引：228

作者：

Trevisanutto, Paolo E. ^{[1
,2
,3
]}

Giorgetti, Christine ^{[3
,4
]}

Reining, Lucia ^{[3
,4
]}

Ladisa, Massimo ^{[5
]}

Olevano, Valerio ^{[1
,2
,3
]}

机构：

[1] CNRS, Inst Neel, Grenoble, France

[2] UJF, Grenoble, France

[3] ETSF, Paris, France

[4] Ecole Polytech, CNRS, CEA, Solides Irradies Lab, F-91128 Palaiseau, France

[5] CNR, Ist Cristallog, I-70126 Bari, Italy

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.101.226405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present an ab initio numerical many-body GW calculation of the band plot in freestanding graphene. We consider the full ionic and electronic structure introducing e-e interaction and correlation effects via a self-energy containing non-Hermitian and dynamical terms. With respect to the density-functional theory local-density approximation, the Fermi velocity is renormalized with an increase of 17%, in better agreement with the experiment. Close to the Dirac point the linear dispersion is modified by the presence of a kink, as observed by angle-resolved photoemission spectroscopy. We demonstrate that the kink is due to low-energy pi ->pi(*) single-particle excitations and to the pi plasmon. The GW self-energy does not open the band gap.

引用

页数：4

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