skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on December 9, 2020

Title: Dirac fermions and flat bands in the ideal kagome metal FeSn

Abstract

A kagome lattice of 3d transition metal ions is a versatile platform for correlated topological phases hosting symmetry-protected electronic excitations and magnetic ground states. However, the paradigmatic states of the idealized two-dimensional kagome lattice-Dirac fermions and flat bands-have not been simultaneously observed. Here, we use angle-resolved photoemission spectroscopy and de Haas-van Alphen quantum oscillations to reveal coexisting surface and bulk Dirac fermions as well as flat bands in the antiferromagnetic kagome metal FeSn, which has spatially decoupled kagome planes. Our band structure calculations and matrix element simulations demonstrate that the bulk Dirac bands arise from in-plane localized Fe-3d orbitals, and evidence that the coexisting Dirac surface state realizes a rare example of fully spin-polarized two-dimensional Dirac fermions due to spin-layer locking in FeSn. Finally, the prospect to harness these prototypical excitations in a kagome lattice is a frontier of great promise at the confluence of topology, magnetism and strongly correlated physics.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [1];  [1];  [3]; ORCiD logo [4];  [4]; ORCiD logo [4];  [5]; ORCiD logo [5]; ORCiD logo [6];  [7];  [7];  [2];  [2];  [3];  [8]; ORCiD logo [9] more »; ORCiD logo [1]; ORCiD logo [1] « less
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Harvard Univ., Cambridge, MA (United States)
  3. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  7. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  8. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Dresden Center for Computational Materials Science (DCMS) (Germany)
  9. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Tribhuvan Univ., Kirtipur, Kathmandu (Nepal)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Gordon and Betty Moore Foundation; US Army Research Office (ARO); National Science Foundation (NSF)
OSTI Identifier:
1581772
Grant/Contract Number:  
[AC02-05CH11231; GBMF3848; W911NF-16-1-0034; DMR-1231319; DMR-1644779; AC02-98CH10886; 1541959]
Resource Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
[ Journal Volume: 19; Journal Issue: 2]; Journal ID: ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; spintronics; topological matter

Citation Formats

Kang, Mingu, Ye, Linda, Fang, Shiang, You, Jhih-Shih, Levitan, Abe, Han, Minyong, Facio, Jorge I., Jozwiak, Chris, Bostwick, Aaron, Rotenberg, Eli, Chan, Mun K., McDonald, Ross D., Graf, David, Kaznatcheev, Konstantine, Vescovo, Elio, Bell, David C., Kaxiras, Efthimios, van den Brink, Jeroen, Richter, Manuel, Prasad Ghimire, Madhav, Checkelsky, Joseph G., and Comin, Riccardo. Dirac fermions and flat bands in the ideal kagome metal FeSn. United States: N. p., 2019. Web. doi:10.1038/s41563-019-0531-0.
Kang, Mingu, Ye, Linda, Fang, Shiang, You, Jhih-Shih, Levitan, Abe, Han, Minyong, Facio, Jorge I., Jozwiak, Chris, Bostwick, Aaron, Rotenberg, Eli, Chan, Mun K., McDonald, Ross D., Graf, David, Kaznatcheev, Konstantine, Vescovo, Elio, Bell, David C., Kaxiras, Efthimios, van den Brink, Jeroen, Richter, Manuel, Prasad Ghimire, Madhav, Checkelsky, Joseph G., & Comin, Riccardo. Dirac fermions and flat bands in the ideal kagome metal FeSn. United States. doi:10.1038/s41563-019-0531-0.
Kang, Mingu, Ye, Linda, Fang, Shiang, You, Jhih-Shih, Levitan, Abe, Han, Minyong, Facio, Jorge I., Jozwiak, Chris, Bostwick, Aaron, Rotenberg, Eli, Chan, Mun K., McDonald, Ross D., Graf, David, Kaznatcheev, Konstantine, Vescovo, Elio, Bell, David C., Kaxiras, Efthimios, van den Brink, Jeroen, Richter, Manuel, Prasad Ghimire, Madhav, Checkelsky, Joseph G., and Comin, Riccardo. Mon . "Dirac fermions and flat bands in the ideal kagome metal FeSn". United States. doi:10.1038/s41563-019-0531-0.
@article{osti_1581772,
title = {Dirac fermions and flat bands in the ideal kagome metal FeSn},
author = {Kang, Mingu and Ye, Linda and Fang, Shiang and You, Jhih-Shih and Levitan, Abe and Han, Minyong and Facio, Jorge I. and Jozwiak, Chris and Bostwick, Aaron and Rotenberg, Eli and Chan, Mun K. and McDonald, Ross D. and Graf, David and Kaznatcheev, Konstantine and Vescovo, Elio and Bell, David C. and Kaxiras, Efthimios and van den Brink, Jeroen and Richter, Manuel and Prasad Ghimire, Madhav and Checkelsky, Joseph G. and Comin, Riccardo},
abstractNote = {A kagome lattice of 3d transition metal ions is a versatile platform for correlated topological phases hosting symmetry-protected electronic excitations and magnetic ground states. However, the paradigmatic states of the idealized two-dimensional kagome lattice-Dirac fermions and flat bands-have not been simultaneously observed. Here, we use angle-resolved photoemission spectroscopy and de Haas-van Alphen quantum oscillations to reveal coexisting surface and bulk Dirac fermions as well as flat bands in the antiferromagnetic kagome metal FeSn, which has spatially decoupled kagome planes. Our band structure calculations and matrix element simulations demonstrate that the bulk Dirac bands arise from in-plane localized Fe-3d orbitals, and evidence that the coexisting Dirac surface state realizes a rare example of fully spin-polarized two-dimensional Dirac fermions due to spin-layer locking in FeSn. Finally, the prospect to harness these prototypical excitations in a kagome lattice is a frontier of great promise at the confluence of topology, magnetism and strongly correlated physics.},
doi = {10.1038/s41563-019-0531-0},
journal = {Nature Materials},
number = [2],
volume = [19],
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on December 9, 2020
Publisher's Version of Record

Save / Share:

Works referenced in this record:

Evidence for magnetic Weyl fermions in a correlated metal
journal, September 2017

  • Kuroda, K.; Tomita, T.; Suzuki, M. -T.
  • Nature Materials, Vol. 16, Issue 11
  • DOI: 10.1038/nmat4987

Observation of a Warped Helical Spin Texture in Bi 2 Se 3 from Circular Dichroism Angle-Resolved Photoemission Spectroscopy
journal, November 2011


Fractional Quantum Hall States at Zero Magnetic Field
journal, June 2011


Direct measurement of quantum phases in graphene via photoemission spectroscopy
journal, September 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

High-Temperature Fractional Quantum Hall States
journal, June 2011


Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions
journal, September 2018


Nearly Flatbands with Nontrivial Topology
journal, June 2011


Spin liquids in frustrated magnets
journal, March 2010


Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal
journal, July 2018


de Haas-van Alphen effect of correlated Dirac states in kagome metal Fe3Sn2
journal, October 2019


Non-collinear antiferromagnets and the anomalous Hall effect
journal, December 2014


Large anomalous Hall effect in a non-collinear antiferromagnet at room temperature
journal, October 2015

  • Nakatsuji, Satoru; Kiyohara, Naoki; Higo, Tomoya
  • Nature, Vol. 527, Issue 7577
  • DOI: 10.1038/nature15723

Highly spin-polarized Dirac fermions at the graphene/Co interface
journal, June 2015


First direct observation of Dirac fermions in graphite
journal, August 2006

  • Zhou, S. Y.; Gweon, G. -H.; Graf, J.
  • Nature Physics, Vol. 2, Issue 9
  • DOI: 10.1038/nphys393

ARPES view on surface and bulk hybridization phenomena in the antiferromagnetic Kondo lattice CeRh2Si2
journal, March 2016

  • Patil, S.; Generalov, A.; Güttler, M.
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms11029

Electrical switching of the topological anomalous Hall effect in a non-collinear antiferromagnet above room temperature
journal, March 2018


Observation of Dirac Cone Electronic Dispersion in BaFe 2 As 2
journal, March 2010


Tunable Polaronic Conduction in Anatase TiO 2
journal, May 2013


Massive Dirac fermions in a ferromagnetic kagome metal
journal, March 2018


Weyl Semimetal in a Topological Insulator Multilayer
journal, September 2011


Large anomalous Hall effect driven by a nonvanishing Berry curvature in the noncolinear antiferromagnet Mn 3 Ge
journal, April 2016

  • Nayak, Ajaya K.; Fischer, Julia Erika; Sun, Yan
  • Science Advances, Vol. 2, Issue 4
  • DOI: 10.1126/sciadv.1501870

Flatbands and Emergent Ferromagnetic Ordering in Fe 3 Sn 2 Kagome Lattices
journal, August 2018


Creating Weyl nodes and controlling their energy by magnetization rotation
journal, December 2019


Intrinsic Quantum Anomalous Hall Effect in the Kagome Lattice Cs 2 LiMn 3 F 12
journal, October 2015


Observation of Dirac cone band dispersions in FeSe thin films by photoemission spectroscopy
journal, March 2016


Correlated insulator behaviour at half-filling in magic-angle graphene superlattices
journal, March 2018


Controlling the Electronic Structure of Bilayer Graphene
journal, August 2006


Observation of topological superconductivity on the surface of an iron-based superconductor
journal, March 2018


Spin superconductor in ferromagnetic graphene
journal, December 2011


Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet
journal, February 2019


Photoemission studies of quantum well states in thin films
journal, September 2000


Topological states on the breathing kagome lattice
journal, April 2019


Topological insulator on the kagome lattice
journal, September 2009


Full-potential nonorthogonal local-orbital minimum-basis band-structure scheme
journal, January 1999


Anomalous Hall Effect Arising from Noncollinear Antiferromagnetism
journal, January 2014


Giant and anisotropic many-body spin–orbit tunability in a strongly correlated kagome magnet
journal, September 2018


Visualizing Electronic Chirality and Berry Phases in Graphene Systems Using Photoemission with Circularly Polarized Light
journal, October 2011


Theoretical prediction of a strongly correlated Dirac metal
journal, July 2014

  • Mazin, I. I.; Jeschke, Harald O.; Lechermann, Frank
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms5261

Interaction-driven topological insulators on the kagome and the decorated honeycomb lattices
journal, August 2010


Muon Spin Precession in the Hexagonal Antiferromagnet FeSn
journal, April 1987