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Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu(2)Si

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 level...

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Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5647340/
https://www.ncbi.nlm.nih.gov/pubmed/29044100
http://dx.doi.org/10.1038/s41467-017-01108-z
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author 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
author_facet 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
author_sort Feng, Baojie
collection PubMed
description 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 PtSn(4), ZrSiS, TlTaSe(2) and PbTaSe(2). 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 Cu(2)Si based on combined theoretical calculations and angle-resolved photoemission spectroscopy measurements. The Dirac nodal lines in Cu(2)Si form two concentric loops centred around the Γ point and are protected by mirror reflection symmetry. Our results establish Cu(2)Si 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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spelling pubmed-56473402017-10-20 Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu(2)Si 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 Nat Commun Article 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 PtSn(4), ZrSiS, TlTaSe(2) and PbTaSe(2). 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 Cu(2)Si based on combined theoretical calculations and angle-resolved photoemission spectroscopy measurements. The Dirac nodal lines in Cu(2)Si form two concentric loops centred around the Γ point and are protected by mirror reflection symmetry. Our results establish Cu(2)Si as a platform to study the novel physical properties in two-dimensional Dirac materials and provide opportunities to realize high-speed low-dissipation devices. Nature Publishing Group UK 2017-10-18 /pmc/articles/PMC5647340/ /pubmed/29044100 http://dx.doi.org/10.1038/s41467-017-01108-z Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
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 Cu(2)Si
title Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu(2)Si
title_full Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu(2)Si
title_fullStr Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu(2)Si
title_full_unstemmed Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu(2)Si
title_short Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu(2)Si
title_sort experimental realization of two-dimensional dirac nodal line fermions in monolayer cu(2)si
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5647340/
https://www.ncbi.nlm.nih.gov/pubmed/29044100
http://dx.doi.org/10.1038/s41467-017-01108-z
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