Graphene superlattice with periodically modulated Dirac gap

被引：45

作者：

Maksimova, G. M. ^{[1
]}

Azarova, E. S. ^{[1
]}

Telezhnikov, A. V. ^{[1
]}

Burdov, V. A. ^{[1
]}

机构：

[1] Univ Nizhny Novgorod, Dept Theoret Phys, Nizhnii Novgorod 603950, Russia

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 20期

基金：

俄罗斯基础研究基金会;

关键词：

KLEIN PARADOX; ELECTRONS;

D O I：

10.1103/PhysRevB.86.205422

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A graphene-based superlattice formed by a periodic gap modulation is studied theoretically by using a Dirac-type Hamiltonian. Analyzing the dispersion relation, we have found that extra Dirac points arise in the electronic spectrum under certain conditions. As a result, the gap between the conduction and valence minibands disappears. The expressions for the positions of these Dirac points in k space and the threshold value of the potential for their emergence were obtained. Also, the dispersion law and renormalized group velocities around the extra Dirac points were calculated. At some parameters of the system, we have revealed interface states which form the top of the valence miniband.

引用

页数：7

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