Dirac electrons in a dodecagonal graphene quasicrystal

被引：255

作者：

Ahn, Sung Joon ^{[1
,2
]}

Moon, Pilkyung ^{[3
,4
,5
]}

Kim, Tae-Hoon ^{[6
]}

Kim, Hyun-Woo ^{[1
,2
]}

Shin, Ha-Chul ^{[1
,2
]}

Kim, Eun Hye ^{[1
,2
]}

Cha, Hyun Woo ^{[6
]}

Kahng, Se-Jong ^{[7
]}

Kim, Philip ^{[8
]}

Koshino, Mikito ^{[9
]}

Son, Young-Woo ^{[10
]}

Yang, Cheol-Woong ^{[6
]}

Ahn, Joung Real ^{[1
,2
,11
]}

机构：

[1] Sungkyunkwan Univ, Dept Phys, Suwon, South Korea

[2] Sungkyunkwan Univ, SAINT, Suwon, South Korea

[3] New York Univ, Shanghai, Peoples R China

[4] NYU Shanghai, ECNU Inst Phys, NYU, Shanghai, Peoples R China

[5] NYU, Dept Phys, 4 Washington Pl, New York, NY 10003 USA

[6] Sungkyunkwan Univ, Sch Adv Mat Sci & Engn, Suwon, South Korea

[7] Korea Univ, Dept Phys, Seoul, South Korea

[8] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[9] Osaka Univ, Dept Phys, Toyonaka, Osaka, Japan

[10] Korea Inst Adv Study, Seoul, South Korea

[11] Sungkyunkwan Univ, Samsung SKKU Graphene Ctr, Suwon, South Korea

来源：

SCIENCE | 2018年 / 361卷 / 6404期

基金：

新加坡国家研究基金会;

关键词：

TWISTED BILAYER GRAPHENE; BAND-STRUCTURE; TRANSPORT; LATTICE; STATES; SYMMETRY; PHASE; LAYER;

D O I：

10.1126/science.aar8412

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：

Quantum states of quasiparticles in solids are dictated by symmetry. We have experimentally demonstrated quantum states of Dirac electrons in a two-dimensional quasicrystal without translational symmetry. A dodecagonal quasicrystalline order was realized by epitaxial growth of twisted bilayer graphene rotated exactly 30 degrees. We grew the graphene quasicrystal up to a millimeter scale on a silicon carbide surface while maintaining the single rotation angle over an entire sample and successfully isolated the quasicrystal from a substrate, demonstrating its structural and chemical stability under ambient conditions. Multiple Dirac cones replicated with the 12-fold rotational symmetry were observed in angle-resolved photoemission spectra, which revealed anomalous strong interlayer coupling with quasi-periodicity. Our study provides a way to explore physical properties of relativistic fermions with controllable quasicrystalline orders.

引用

页码：782 / +

页数：5

共 54 条

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