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

Feng, Baojie; Fu, Botao; Kasamatsu, Shusuke; Ito, Suguru; Cheng, Peng; Liu, Cheng-Cheng; Feng, Ya; Wu, Shilong; Mahatha, Sanjoy K.; Sheverdyaeva, Polina; Moras, Paolo; Arita, Masashi; Sugino, Osamu; Chiang, Tai-Chang; Shimada, Kenya; Miyamoto, Koji; Okuda, Taichi; Wu, Kehui; Chen, Lan; Yao, Yugui; Matsuda, Iwao

doi:10.1038/s41467-017-01108-z

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

Journal Article · 18 October 2017 · Nature Communications

DOI: https://doi.org/10.1038/s41467-017-01108-z · OSTI ID:1499693

^[1]; Fu, Botao ^[2]; Kasamatsu, Shusuke ^[3]; Ito, Suguru ^[3]; Cheng, Peng ^[4];

^[2]; Feng, Ya ^[5];

^[6]; Mahatha, Sanjoy K. ^[7];

^[7];

^[7]; Arita, Masashi ^[6]; Sugino, Osamu ^[3]; Chiang, Tai-Chang ^[8]; Shimada, Kenya ^[6]; Miyamoto, Koji ^[6]; Okuda, Taichi ^[6]; Wu, Kehui ^[4]; Chen, Lan ^[4]; Yao, Yugui ^[2] more »

Univ. of Tokyo,Tokyo (Japan); Hiroshima Univ., Hiroshima (Japan)
Beijing Inst. of Technology, Beijing (China)
Univ. of Tokyo,Tokyo (Japan)
Chinese Academy of Sciences (CAS), Beijing (China)
Hiroshima Univ., Hiroshima (Japan); Chinese Academy of Sciences (CAS), Beijing (China)
Hiroshima Univ., Hiroshima (Japan)
Istituto di Struttura della Materia (ISM), Trieste (Italy)
Univ. of Illinois, Chicago, IL (United States)

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 Γ point and are protected by mirror reflection symmetry. In conclusion, 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.

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Research Organization:: Univ. of Illinois, Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-07ER46383

OSTI ID:: 1499693

Journal Information:: Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 209 works

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