Emergence of Tertiary Dirac Points in Graphene Moire Superlattices

被引：31

作者：

Chen, Guorui ^{[1
,2
,3
]}

Sui, Mengqiao ^{[1
,2
,3
]}

Wang, Duoming ^{[4
,5
]}

Wang, Shuopei ^{[4
,5
]}

Jung, Jeil ^{[6
]}

Moon, Pilkyung ^{[7
,8
]}

Adam, Shaffique ^{[9
,10
]}

Watanabe, Kenji ^{[11
]}

Taniguchi, Takashi ^{[11
]}

Zhou, Shuyun ^{[12
,13
,14
]}

Koshino, Mikito ^{[15
]}

Zhang, Guangyu ^{[4
,5
]}

Zhane, Yuanbo ^{[1
,2
,3
]}

机构：

[1] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[2] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

[3] Fudan Univ, Collaborat Innovat Ctr Adv Microstruct, Shanghai 200433, Peoples R China

[4] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[5] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[6] Univ Seoul, Dept Phys, Seoul 02504, South Korea

[7] New York Univ, Shanghai 200120, Peoples R China

[8] NYU Shanghai, NYU ECNU Inst Phys, Shanghai 200062, Peoples R China

[9] Natl Univ Singapore, Graphene Res Ctr, 2 Sci Dr 3, Singapore 117551, Singapore

[10] Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117551, Singapore

[11] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

[12] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[13] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[14] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

[15] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan

来源：

NANO LETTERS | 2017年 / 17卷 / 06期

基金：

新加坡国家研究基金会;

关键词：

Graphene; moire pattern; graphene superlattice; tertialy Dirac point Landau level; FERMIONS; ELECTRONS; GAPS;

D O I：

10.1021/acs.nanolett.7b00735

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The electronic structure of a crystalline solid is largely determined by its lattice structure. Recent advances in van der Waals solids, artificial crystals with controlled stacking of two-dimensional (2D) atomic films, have enabled the creation of materials with novel electronic structures. In particular, stacking graphene on hexagonal boron nitride (hBN) introduces a moire superlattice that fundamentally modifies graphenes band structure and gives rise to secondary Dirac points (SDPs). Here we find that the formation of a moire superlattice in graphene on hBN yields new, unexpected consequences: a set of tertiary Dirac points (TDPs) emerge, which give rise to additional sets of Landau levels when the sample is subjected to an external magnetic field. Our observations hint at the formation of a hidden Kekule superstructure on top of the moire superlattice under appropriate carrier doping and magnetic fields.

引用

页码：3576 / 3581

页数：6

共 37 条

[1] Hidden Kekule ordering of adatoms on graphene [J].