Electron Interactions and Gap Opening in Graphene Superlattices

被引：121

作者：

Song, Justin C. W. ^{[1
,2
]}

Shytov, Andrey V. ^{[3
]}

Levitov, Leonid S. ^{[1
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[3] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 26期

关键词：

DIRAC FERMIONS; BORON-NITRIDE;

D O I：

10.1103/PhysRevLett.111.266801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We develop a theory of interaction effects in graphene superlattices, where tunable superlattice periodicity can be used as a knob to control the gap at the Dirac point. Applied to graphene on hexaboron-nitride (G/h-BN), our theory predicts substantial many-body enhancement of this gap. Tunable by the moire superlattice periodicity, a few orders of magnitude enhancement is reachable under optimal conditions. The Dirac point gap enhancement can be much larger than that of the minigaps opened by Bragg scattering at principal superlattice harmonics. This naturally explains the conundrum of large Dirac point gaps recently observed in G/h-BN heterostructures and their tunability by the G/h-BN twist angle.

引用

页数：5

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