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 () and Iwao Matsuda ()
Additional contact information
Baojie Feng: The University of Tokyo
Botao Fu: Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology
Shusuke Kasamatsu: The University of Tokyo
Suguru Ito: The University of Tokyo
Peng Cheng: Institute of Physics, Chinese Academy of Sciences
Cheng-Cheng Liu: Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology
Ya Feng: Hiroshima University
Shilong Wu: Hiroshima University
Sanjoy K. Mahatha: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche
Polina Sheverdyaeva: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche
Paolo Moras: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche
Masashi Arita: Hiroshima University
Osamu Sugino: The University of Tokyo
Tai-Chang Chiang: University of Illinois
Kenya Shimada: Hiroshima University
Koji Miyamoto: Hiroshima University
Taichi Okuda: Hiroshima University
Kehui Wu: Institute of Physics, Chinese Academy of Sciences
Lan Chen: Institute of Physics, Chinese Academy of Sciences
Yugui Yao: Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology
Iwao Matsuda: The University of Tokyo

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-01108-z

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