Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si

被引：258

作者：

Feng, Baojie ^{[1
,2
]}

Fu, Botao ^{[3
]}

Kasamatsu, Shusuke ^{[1
]}

Ito, Suguru ^{[1
]}

Cheng, Peng ^{[4
]}

Liu, Cheng-Cheng ^{[3
]}

Feng, Ya ^{[2
,5
]}

Wu, Shilong ^{[2
]}

Mahatha, Sanjoy K. ^{[6
]}

Sheverdyaeva, Polina ^{[6
]}

Moras, Paolo ^{[6
]}

Arita, Masashi ^{[2
]}

Sugino, Osamu ^{[1
]}

Chiang, Tai-Chang ^{[7
]}

Shimada, Kenya ^{[2
]}

Miyamoto, Koji ^{[2
]}

Okuda, Taichi ^{[2
]}

Wu, Kehui ^{[4
]}

Chen, Lan ^{[4
]}

Yao, Yugui ^{[3
]}

Matsuda, Iwao ^{[1
]}

机构：

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

[2] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, 2-313 Kagamiyama, Higashihiroshima 7390046, Japan

[3] Beijing Inst Technol, Sch Phys, Beijing Key Lab Nanophoton & Ultrafine Optoelect, Beijing 100081, Peoples R China

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

[5] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China

[6] Ist Struttura Mat, Consiglio Nazl Ric, I-34149 Trieste, Italy

[7] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

关键词：

SURFACE ALLOY; DISCOVERY; SEMIMETAL; CU(111);

D O I：

10.1038/s41467-017-01108-z

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：

Topological nodal line semimetals, a novel quantum state of materials, possess topologically nontrivial valence and conduction bands that touch at a line near the Fermi level. The exotic band structure can lead to various novel properties, such as long-range Coulomb interaction and flat Landau levels. Recently, topological nodal lines have been observed in several bulk materials, such as PtSn4, ZrSiS, TlTaSe2 and PbTaSe2. However, in two-dimensional materials, experimental research on nodal line fermions is still lacking. Here, we report the discovery of two-dimensional Dirac nodal line fermions in monolayer Cu2Si based on combined theoretical calculations and angle-resolved photoemission spectroscopy measurements. The Dirac nodal lines in Cu2Si form two concentric loops centred around the Gamma point and are protected by mirror reflection symmetry. Our results establish Cu2Si as a platform to study the novel physical properties in two-dimensional Dirac materials and provide opportunities to realize high-speed low-dissipation devices.

引用

页数：6

共 34 条

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