Supercritical Coulomb impurities in gapped graphene

被引：96

作者：

Pereira, Vitor M. ^{[1
]}

Kotov, Valeri N. ^{[1
]}

Castro Neto, A. H. ^{[1
]}

机构：

[1] Boston Univ, Dept Phys, Boston, MA 02215 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.78.085101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the problem of Coulomb field-induced charging of the ground state in a system of two-dimensional (2D) massive Dirac particles-gapped graphene. As in its 3D QED counterpart, the critical Coulomb coupling is renormalized to higher values compared to the massless case. We find that in gapped graphene, a different supercritical regime is possible, where the screening charge is comparable to the impurity charge; thus, leading to suppression of the Coulomb field at nanometer scales. We corroborate this with a numerical solution of the tight-binding problem on the honeycomb lattice.

引用

页数：8

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