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Dirac fermions and flat bands in the ideal kagome metal FeSn

by Ye, Linda , Kaznatcheev, Konstantine , Comin, Riccardo , Levitan, Abe , Rotenberg, Eli , Chan, Mun K. , Facio, Jorge I. , Vescovo, Elio , Kang, Mingu , Richter, Manuel , Jozwiak, Chris , Han, Minyong , Graf, David , Prasad Ghimire, Madhav , You, Jhih-Shih , Fang, Shiang , van den Brink, Jeroen , Kaxiras, Efthimios , Bell, David C. , Checkelsky, Joseph G. , McDonald, Ross D. , Bostwick, Aaron

in 140/146 / 639/766/119/1001 / 639/766/119/2792 / 639/766/119/995 / Antiferromagnetism / Biomaterials / Chemistry and Materials Science / Computer simulation / Condensed Matter Physics / electronic properties and materials / Energy / Excitation / Fermions / Kagome lattice / Laboratories / Locking / Magnetic fields / Magnetic properties / Magnetism / MATERIALS SCIENCE / Metals / Nanotechnology / Optical and Electronic Materials / Phenomenology / Photoelectric emission / Physics / Spectrum analysis / spintronics / topological matter / Topology / Transition metals

2020

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Dirac fermions and flat bands in the ideal kagome metal FeSn

2020

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2020

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Journal Article

Dirac fermions and flat bands in the ideal kagome metal FeSn

Ye, Linda,

Kaznatcheev, Konstantine,

Comin, Riccardo,

Levitan, Abe,

Rotenberg, Eli,

Chan, Mun K.,

Facio, Jorge I.,

Vescovo, Elio,

Kang, Mingu,

Richter, Manuel,

Jozwiak, Chris,

Han, Minyong,

Graf, David,

Prasad Ghimire, Madhav,

You, Jhih-Shih,

Fang, Shiang,

van den Brink, Jeroen,

Kaxiras, Efthimios,

Bell, David C.,

Checkelsky, Joseph G.,

McDonald, Ross D.,

Bostwick, Aaron

2020

Overview

A kagome lattice of 3 d 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-3 d 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. 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. A prototypical kagome metal with magnetic and topological properties is identified.

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Publisher

Nature Publishing Group UK,Nature Publishing Group,Springer Nature - Nature Publishing Group

Subject

/ Chemistry and Materials Science