Moire minibands in graphene heterostructures with almost commensurate √3 x √3 hexagonal crystals

被引：29

作者：

Wallbank, J. R. ^{[1
]}

Mucha-Kruczynski, M. ^{[1
,2
]}

Fal'ko, V. I. ^{[1
]}

机构：

[1] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

[2] Univ Bath, Dept Phys, Bath BA2 7AY, Avon, England

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 15期

基金：

英国工程与自然科学研究理事会;

关键词：

ELECTRONIC-PROPERTIES; (111)B SURFACES; DIRAC FERMIONS; SUPERLATTICES; SELENIDE; GALLIUM;

D O I：

10.1103/PhysRevB.88.155415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a phenomenological theory of the low-energy moire minibands of Dirac electrons in graphene placed on an almost commensurate hexagonal underlay with a unit cell approximately three times larger than that of graphene. A slight incommensurability results in a periodically modulated intervalley scattering for electrons in graphene. In contrast to the perfectly commensurate Kekule distortion of graphene, such superlattice perturbation leaves the zero-energy Dirac cones intact, but is able to open a band gap at the edge of the first moire subbands, asymmetrically in the conduction and valence bands.

引用

页数：5

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