Dirac Fermions in Borophene

被引：406

作者：

Feng, Baojie ^{[1
]}

Sugino, Osamu ^{[1
]}

Liu, Ro-Ya ^{[1
]}

Zhang, Jin ^{[2
]}

Yukawa, Ryu ^{[3
]}

Kawamura, Mitsuaki ^{[1
]}

Iimori, Takushi ^{[1
]}

Kim, Howon ^{[1
]}

Hasegawa, Yukio ^{[1
]}

Li, Hui ^{[2
]}

Chen, Lan ^{[2
]}

Wu, Kehui ^{[2
,4
]}

Kumigashira, Hiroshi ^{[3
]}

Komori, Fumio ^{[1
]}

Chiang, Tai-Chang ^{[1
,5
]}

Meng, Sheng ^{[2
,4
]}

Matsuda, Iwao ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

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

[3] High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[4] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

[5] Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 09期

基金：

美国国家科学基金会; 日本学术振兴会; 中国国家自然科学基金; 日本科学技术振兴机构;

关键词：

2-DIMENSIONAL BORON; GRAPHENE; SILICENE; GROWTH; RISE;

D O I：

10.1103/PhysRevLett.118.096401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Honeycomb structures of group IV elements can host massless Dirac fermions with nontrivial Berry phases. Their potential for electronic applications has attracted great interest and spurred a broad search for new Dirac materials especially in monolayer structures. We present a detailed investigation of the beta(12) sheet, which is a borophene structure that can form spontaneously on a Ag(111) surface. Our tight-binding analysis revealed that the lattice of the beta(12) sheet could be decomposed into two triangular sublattices in a way similar to that for a honeycomb lattice, thereby hosting Dirac cones. Furthermore, each Dirac cone could be split by introducing periodic perturbations representing overlayer-substrate interactions. These unusual electronic structures were confirmed by angle-resolved photoemission spectroscopy and validated by first-principles calculations. Our results suggest monolayer boron as a new platform for realizing novel high-speed low-dissipation devices.

引用

页数：6

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