Dirac fermions and flat bands in the ideal kagome metal FeSn

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

doi:10.1038/s41563-019-0531-0

Dirac fermions and flat bands in the ideal kagome metal FeSn

Journal Article · Sun Dec 08 23:00:00 EST 2019 · Nature Materials

DOI:https://doi.org/10.1038/s41563-019-0531-0· OSTI ID:1581772

^[1]; ^[1]; ^[2]; ^[3]; Levitan, Abe ^[1]; Han, Minyong ^[1]; Facio, Jorge I. ^[3]; ^[4]; Bostwick, Aaron ^[4]; ^[4]; Chan, Mun K. ^[5]; ^[5]; ^[6]; Kaznatcheev, Konstantine ^[7]; Vescovo, Elio ^[7]; Bell, David C. ^[2]; Kaxiras, Efthimios ^[2]; van den Brink, Jeroen ^[3]; Richter, Manuel ^[8]; ^[9] more »

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Harvard Univ., Cambridge, MA (United States)
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Dresden Center for Computational Materials Science (DCMS) (Germany)
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Tribhuvan Univ., Kirtipur, Kathmandu (Nepal)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: AC02-05CH11231; AC02-98CH10886

OSTI ID:: 1581772

Alternate ID(s):: OSTI ID: 1658812
OSTI ID: 1779667

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 2 Vol. 19; ISSN 1476-1122

Publisher:: Springer Nature - Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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