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

Author

Listed:
  • Baojie Feng

    (The University of Tokyo
    Hiroshima University)

  • 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
    Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences)

  • 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)

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.

Suggested Citation

  • 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 & T, 2017. "Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si," Nature Communications, Nature, vol. 8(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01108-z
    DOI: 10.1038/s41467-017-01108-z
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