Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

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. 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:
ORCiD logo [1];  [2];  [3];  [3];  [4]; ORCiD logo [2];  [5]; ORCiD logo [6];  [7]; ORCiD logo [7]; ORCiD logo [7];  [6];  [3];  [8];  [6];  [6];  [6];  [4];  [4];  [2] more »;  [3] « less
+ Show Author Affiliations
  1. Univ. of Tokyo,Tokyo (Japan); Hiroshima Univ., Hiroshima (Japan)
  2. Beijing Inst. of Technology, Beijing (China)
  3. Univ. of Tokyo,Tokyo (Japan)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. Hiroshima Univ., Hiroshima (Japan); Chinese Academy of Sciences (CAS), Beijing (China)
  6. Hiroshima Univ., Hiroshima (Japan)
  7. Istituto di Struttura della Materia (ISM), Trieste (Italy)
  8. 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.
Copy to clipboard
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
Copy to clipboard
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.
Copy to clipboard
@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 = {2017},
month = {10}
}
Copy to clipboard
Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41467-017-01108-z
Copyright Statement
Other availability
Search WorldCat Search WorldCat to find libraries that may hold this journal
Citation Metrics:
Cited by: 182 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1 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 » the binding energy. For simplicity, we label the three bands that cross the Fermi level $α$, $β$, and $γ$, respectively. The parity of mirror reflection symmetry for each band is labelled plus and minus signs in b. The zoom-in band structures in the blue and red ellipses are shown in g, h. d Band structure of Cu2Si after artificially increasing the intrinsic SOC by 20 times. e Fermi surface of Cu2Si without SOC. The blue, orange, and green lines correspond to bands $α, β$, and $γ$, respectively. f Momentum distribution of the nodal loops: NL1 (blue) and NL2 (orange). g, h Zoom-in band structures in the blue and red ellipses in c, which clearly show the SOC-induced gaps« less
All figures and tables (4 total)
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

Works referenced in this record:

Topological nodal semimetals
journal, December 2011

Generalized Gradient Approximation Made Simple
journal, October 1996

  • Perdew, John P.; Burke, Kieron; Ernzerhof, Matthias
  • Physical Review Letters, Vol. 77, Issue 18, p. 3865-3868
  • DOI: 10.1103/PhysRevLett.77.3865

Topological insulators and superconductors
journal, October 2011

Atomic structure of the Cu/Si(111) interface by high-energy core-level Auger electron diffraction
journal, July 1985

A NIXSW structural investigation of the (√3×√3)R30°-Cu2Si surface alloy phase formed by SiH4 reaction with Cu(111)
journal, September 2001

Graphene-Like Two-Dimensional Materials
journal, January 2013

  • Xu, Mingsheng; Liang, Tao; Shi, Minmin
  • Chemical Reviews, Vol. 113, Issue 5, p. 3766-3798
  • DOI: 10.1021/cr300263a

Drumhead surface states and topological nodal-line fermions in TlTaSe 2
journal, March 2016

Two-Dimensional Cu 2 Si Monolayer with Planar Hexacoordinate Copper and Silicon Bonding
journal, February 2015

  • Yang, Li-Ming; Bačić, Vladimir; Popov, Ivan A.
  • Journal of the American Chemical Society, Vol. 137, Issue 7
  • DOI: 10.1021/ja513209c

Topological nodal-line fermions in spin-orbit metal PbTaSe2
journal, February 2016

  • Bian, Guang; Chang, Tay-Rong; Sankar, Raman
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms10556

Dirac node arcs in PtSn4
journal, April 2016

  • Wu, Yun; Wang, Lin-Lin; Mun, Eundeok
  • Nature Physics, Vol. 12, Issue 7
  • DOI: 10.1038/nphys3712

Methylsilane on Cu(111), a STM study of the R30°-Cu2Si surface silicide
journal, July 2005

Interaction of silane with Cu(111): Surface alloy and molecular chemisorbed phases
journal, April 1997

Dirac cone protected by non-symmorphic symmetry and three-dimensional Dirac line node in ZrSiS
journal, May 2016

  • Schoop, Leslie M.; Ali, Mazhar N.; Straßer, Carola
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms11696

Colloquium: Topological insulators
journal, November 2010

Observation of topological nodal fermion semimetal phase in ZrSiS
journal, May 2016

A simple tight-binding model of spin–orbit splitting of sp-derived surface states
journal, July 2000

Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set
journal, October 1996

Discovery of a Three-Dimensional Topological Dirac Semimetal, Na3Bi
journal, January 2014

Microscopic structure, discommensurations, and tiling of Si(111)/Cu-‘‘5×5’’
journal, July 1992

The prediction of a family group of two-dimensional node-line semimetals
journal, January 2017

  • Jin, Yuan-Jun; Wang, Rui; Zhao, Jin-Zhu
  • Nanoscale, Vol. 9, Issue 35
  • DOI: 10.1039/C7NR03520A

Deduction of a three-phase model for the (√3×√3)R30°-Cu2Si/Cu(111) surface alloy
journal, November 2009

Discovery of a Weyl fermion semimetal and topological Fermi arcs
journal, July 2015

Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
text, January 2013

Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
text, January 2015

    Sort by:
    [ × clear filter / sort ]

    Works referencing / citing this record:

    Epitaxial Growth of Honeycomb Monolayer CuSe with Dirac Nodal Line Fermions
    journal, March 2018

    Large‐Spin‐Gap Nodal‐Line Half‐Metal and High‐Temperature Ferromagnetic Semiconductor in Cr 2 X 3 (X=O,S,Se) Monolayers
    journal, October 2019

    • Chen, Jian‐Yong; Li, Xing‐Xing; Zhou, Wen‐Zhe
    • Advanced Electronic Materials, Vol. 6, Issue 1
    • DOI: 10.1002/aelm.201900490

    Computational Prediction of the Low‐Temperature Ferromagnetic Semiconducting 2D SiN Monolayer
    journal, September 2019

    • Tkachenko, Nikolay V.; Song, Bingyi; Steglenko, Dmitriy
    • physica status solidi (b), Vol. 257, Issue 3
    • DOI: 10.1002/pssb.201900619

    Low‐Energy GeP Monolayers with Natural Type‐II Homojunctions for SunLight‐Driven Water Splitting
    journal, May 2019

    • Jiao, Na; Zhou, Pan; He, Chaoyu
    • physica status solidi (RRL) – Rapid Research Letters, Vol. 13, Issue 12
    • DOI: 10.1002/pssr.201900470

    Topological quantum catalyst: Dirac nodal line states and a potential electrocatalyst of hydrogen evolution in the TiSi family
    journal, December 2017

    Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets
    journal, July 2019

    A two-dimensional CaSi monolayer with quasi-planar pentacoordinate silicon
    journal, January 2018

    • Wang, Yu; Qiao, Man; Li, Yafei
    • Nanoscale Horizons, Vol. 3, Issue 3
    • DOI: 10.1039/c7nh00091j

    Discovery of a novel spin-polarized nodal ring in a two-dimensional HK lattice
    journal, January 2018

    • Zhang, Liang; Zhang, Shu-feng; Ji, Wei-xiao
    • Nanoscale, Vol. 10, Issue 44
    • DOI: 10.1039/c8nr05383a

    Two-dimensional honeycomb borophene oxide: strong anisotropy and nodal loop transformation
    journal, January 2019

    • Zhong, Chengyong; Wu, Weikang; He, Junjie
    • Nanoscale, Vol. 11, Issue 5
    • DOI: 10.1039/c8nr08729f

    Hydrogenated derivatives of hexacoordinated metallic Cu 2 Si monolayer
    journal, January 2018

    • Unsal, E.; Iyikanat, F.; Sahin, H.
    • RSC Advances, Vol. 8, Issue 70
    • DOI: 10.1039/c8ra07824f

    Discovery of cobweb-like MoC 6 and its application for nitrogen fixation
    journal, January 2018

    • Chen, Z. W.; Lang, X. Y.; Jiang, Q.
    • Journal of Materials Chemistry A, Vol. 6, Issue 20
    • DOI: 10.1039/c8ta03481h

    Predicting multiple Dirac-cones and ultrahigh Fermi velocity in perovskite R 3̄ c phase LaCuO 3
    journal, January 2018

    • Zhang, Chunmei; Jiao, Yalong; Kou, Liangzhi
    • Journal of Materials Chemistry C, Vol. 6, Issue 23
    • DOI: 10.1039/c8tc00872h

    Hexagonal M 2 C 3 (M = As, Sb, and Bi) monolayers: new functional materials with desirable band gaps and ultrahigh carrier mobility
    journal, January 2018

    • Liu, Peng-Fei; Bo, Tao; Liu, Zhifeng
    • Journal of Materials Chemistry C, Vol. 6, Issue 46
    • DOI: 10.1039/c8tc04165b

    Bipolar magnetism in a two-dimensional NbS 2 semiconductor with high Curie temperature
    journal, January 2018

    • Sun, Yingjie; Zhuo, Zhiwen; Wu, Xiaojun
    • Journal of Materials Chemistry C, Vol. 6, Issue 42
    • DOI: 10.1039/c8tc04188a

    Perfect planar tetra-coordinated MC 6 monolayer: superior anode material for Li-ion battery
    journal, January 2019

    • Lu, Shaohua; Yang, Chuncheng; Fan, Dong
    • Physical Chemistry Chemical Physics, Vol. 21, Issue 27
    • DOI: 10.1039/c9cp01825e

    TMC (TM = Co, Ni, and Cu) monolayers with planar pentacoordinate carbon and their potential applications
    journal, January 2019

    • Zhu, Changyan; Lv, Haifeng; Qu, Xin
    • Journal of Materials Chemistry C, Vol. 7, Issue 21
    • DOI: 10.1039/c9tc00635d

    Emergence of superconductivity in a Dirac nodal-line Cu 2 Si monolayer: ab initio calculations
    journal, January 2019

    • Yan, Luo; Liu, Peng-Fei; Bo, Tao
    • Journal of Materials Chemistry C, Vol. 7, Issue 35
    • DOI: 10.1039/c9tc03740c

    Superconductivity in predicted two dimensional XB 6 (X = Ga, In)
    journal, January 2020

    • Yan, Luo; Bo, Tao; Liu, Peng-Fei
    • Journal of Materials Chemistry C, Vol. 8, Issue 5
    • DOI: 10.1039/c9tc05783h

    Barrier tunneling of the loop-nodal semimetal in the hyperhoneycomb lattice
    journal, April 2018

    • Guan, Ji-Huan; Zhang, Yan-Yang; Lu, Wei-Er
    • Journal of Physics: Condensed Matter, Vol. 30, Issue 18
    • DOI: 10.1088/1361-648x/aab8dc

    Isolated highly localized bands in YBi 2 monolayer caused by 4 f orbitals
    journal, September 2018

    Prediction of staggered stacking 2D BeP semiconductor with unique anisotropic electronic properties
    journal, November 2019

    Topological node line semimetal state in two-dimensional tetragonal allotrope of Ge and Sn
    journal, March 2019

    Ferromagnetic nodal-line metal in monolayer h -InC
    journal, July 2019

    Fully spin-polarized open and closed nodal lines in β -borophene by magnetic proximity effect
    journal, September 2019

    Dual topological insulator and insulator-semimetal transition in mirror-symmetric honeycomb materials
    journal, November 2019

    Plateaus of quantized conductance with high steps in topological nodal-line semimetals
    journal, January 2020

    Spin-orbit-stable type-II nodal line band crossing in n -doped monolayer Mo X 2 ( X = S , Se,Te)
    journal, December 2018

    Underlying Topological Dirac Nodal Line Mechanism of the Anomalously Large Electron-Phonon Coupling Strength on a Be (0001) Surface
    journal, September 2019

    Monolayer Mg 2 C : Negative Poisson's ratio and unconventional two-dimensional emergent fermions
    journal, October 2018

    Dirac nodal lines protected against spin-orbit interaction in IrO 2
    journal, June 2019

    Two-dimensional nodal-loop half-metal in monolayer MnN
    journal, August 2019

    Two-dimensional nodal-loop half metal in monolayer MnN
    text, January 2019

      Sort by:
      [ × clear filter / sort ]

      Figures / Tables found in this record:

      Fig. 1 (p. 2)figure
      Fig. 2 (p. 3)figure
      Fig. 3 (p. 4)figure
      Fig. 4 (p. 4)figure
        [ × clear filter / sort ]
        Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

        Similar Records in DOE PAGES and OSTI.GOV collections: