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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
+ Show Author Affiliations
  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.:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation; US Army Research Office (ARO); National Science Foundation (NSF); Samsung Foundation of Culture; Tsinghua Ed fucation Foundation; German Research Foundation (DFG); Alexander von Humboldt Foundation; State of Florida
OSTI Identifier:
1581772
Alternate Identifier(s):
OSTI ID: 1658812; OSTI ID: 1779667
Report Number(s):
BNL-216346-2020-JAAM; LA-UR-19-25215
Journal ID: ISSN 1476-1122; ark:/13030/qt2d33974x
Grant/Contract Number:  
AC02-05CH11231; GBMF3848; W911NF-16-1-0034; DMR-1231319; DMR-1644779; AC02-98CH10886; 1541959; SC0012704; 89233218CNA000001
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.
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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. https://doi.org/10.1038/s41563-019-0531-0
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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. https://doi.org/10.1038/s41563-019-0531-0. https://www.osti.gov/servlets/purl/1581772.
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@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 = {Mon Dec 09 00:00:00 EST 2019},
month = {Mon Dec 09 00:00:00 EST 2019}
}
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