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

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

doi:10.1038/s41467-017-01108-z

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

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

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article › peer-review

236 Citations (Scopus)

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. 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.

Original language	English
Article number	1007
Journal	Nature Communications
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41467-017-01108-z
Publication status	Published - 1 Dec 2017

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Feng, B., Fu, B., Kasamatsu, S., Ito, S., Cheng, P., Liu, C. C., Feng, Y., Wu, S., Mahatha, S. K., Sheverdyaeva, P., Moras, P., Arita, M., Sugino, O., Chiang, T. C., Shimada, K., Miyamoto, K., Okuda, T., Wu, K., Chen, L., ... Matsuda, I. (2017). Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu₂Si. Nature Communications, 8(1), Article 1007. https://doi.org/10.1038/s41467-017-01108-z

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title = "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. 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.",

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

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year = "2017",

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doi = "10.1038/s41467-017-01108-z",

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Feng, B, Fu, B, Kasamatsu, S, Ito, S, Cheng, P, Liu, CC, Feng, Y, Wu, S, Mahatha, SK, Sheverdyaeva, P, Moras, P, Arita, M, Sugino, O, Chiang, TC, Shimada, K, Miyamoto, K, Okuda, T, Wu, K, Chen, L, Yao, Y & Matsuda, I 2017, 'Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu₂Si', Nature Communications, vol. 8, no. 1, 1007. https://doi.org/10.1038/s41467-017-01108-z

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T1 - Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si

AU - Feng, Baojie

AU - Fu, Botao

AU - Kasamatsu, Shusuke

AU - Ito, Suguru

AU - Cheng, Peng

AU - Liu, Cheng Cheng

AU - Feng, Ya

AU - Wu, Shilong

AU - Mahatha, Sanjoy K.

AU - Sheverdyaeva, Polina

AU - Moras, Paolo

AU - Arita, Masashi

AU - Sugino, Osamu

AU - Chiang, Tai Chang

AU - Shimada, Kenya

AU - Miyamoto, Koji

AU - Okuda, Taichi

AU - Wu, Kehui

AU - Chen, Lan

AU - Yao, Yugui

AU - Matsuda, Iwao

PY - 2017/12/1

Y1 - 2017/12/1

N2 - 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. 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.

AB - 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. 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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JO - Nature Communications

JF - Nature Communications

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

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