Moire bands in twisted double-layer graphene

被引：2214

作者：

Bistritzer, Rafi ^{[1
]}

MacDonald, Allan H. ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2011年 / 108卷 / 30期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1073/pnas.1108174108

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A moire pattern is formed when two copies of a periodic pattern are overlaid with a relative twist. We address the electronic structure of a twisted two-layer graphene system, showing that in its continuum Dirac model the moire pattern periodicity leads to moire Bloch bands. The two layers become more strongly coupled and the Dirac velocity crosses zero several times as the twist angle is reduced. For a discrete set of magic angles the velocity vanishes, the lowest moire band flattens, and the Dirac-point density-of-states and the counterflow conductivity are strongly enhanced.

引用

页码：12233 / 12237

页数：5

共 30 条

[1]

Amidror I, 2009, COMPUT IMAGING VIS, V38, P1

[2] Gate-induced band ferromagnetism in an organic polymer [J].