Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si
Abstract
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.
- Authors:
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[1];
[2];
[6];
[7];
[7];
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)
- Publication Date:
- Research Org.:
- Univ. of Illinois, Chicago, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1499693
- Grant/Contract Number:
- FG02-07ER46383
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
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, and Matsuda, Iwao. Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si. United States: N. p., 2017.
Web. doi:10.1038/s41467-017-01108-z.
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. Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si. United States. https://doi.org/10.1038/s41467-017-01108-z
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, and Matsuda, Iwao. Wed .
"Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si". United States. https://doi.org/10.1038/s41467-017-01108-z. https://www.osti.gov/servlets/purl/1499693.
@article{osti_1499693,
title = {Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si},
author = {Feng, Baojie and Fu, Botao and Kasamatsu, Shusuke and Ito, Suguru and Cheng, Peng and Liu, Cheng-Cheng and Feng, Ya and Wu, Shilong and Mahatha, Sanjoy K. and Sheverdyaeva, Polina and Moras, Paolo and Arita, Masashi and Sugino, Osamu and Chiang, Tai-Chang and Shimada, Kenya and Miyamoto, Koji and Okuda, Taichi and Wu, Kehui and Chen, Lan and Yao, Yugui and Matsuda, Iwao},
abstractNote = {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.},
doi = {10.1038/s41467-017-01108-z},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {Wed Oct 18 00:00:00 EDT 2017},
month = {Wed Oct 18 00:00:00 EDT 2017}
}
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Figures / Tables:
Fig. 1 : Atomic and band structures of free-standing Cu2Si. a Top and side view. The orange and blue balls represent Cu and Si atoms, respectively. b, c Calculated band structures of Cu2Si without and with spin-orbit coupling (SOC), respectively. The vertical axis $E-E$$F$ corresponds to -$E$$B$, where $E$$B$ ismore »
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