Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn
Name
s41467-021-25705-1.pdf
Description
Published version
Size
1.73 MB
Format
Adobe PDF
Checksum (MD5)
67a57feca7d52e76db0e7e4a9189d97a
Author(s)
Han, Minyong
Inoue, Hisashi
Fang, Shiang
John, Caolan
Ye, Linda
Chan, Mun K
Graf, David
Suzuki, Takehito
Ghimire, Madhav Prasad
Cho, Won Joon
Date Issued
2021
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Han, Minyong, Inoue, Hisashi, Fang, Shiang, John, Caolan, Ye, Linda et al. 2021. "Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn." Nature Communications, 12 (1).
Version
Final published version
Abstract
AbstractThe kagome lattice has long been regarded as a theoretical framework that connects lattice geometry to unusual singularities in electronic structure. Transition metal kagome compounds have been recently identified as a promising material platform to investigate the long-sought electronic flat band. Here we report the signature of a two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn by means of planar tunneling spectroscopy. Employing a Schottky heterointerface of FeSn and an n-type semiconductor Nb-doped SrTiO3, we observe an anomalous enhancement in tunneling conductance within a finite energy range of FeSn. Our first-principles calculations show this is consistent with a spin-polarized flat band localized at the ferromagnetic kagome layer at the Schottky interface. The spectroscopic capability to characterize the electronic structure of a kagome compound at a thin film heterointerface will provide a unique opportunity to probe flat band induced phenomena in an energy-resolved fashion with simultaneous electrical tuning of its properties. Furthermore, the exotic surface state discussed herein is expected to manifest as peculiar spin-orbit torque signals in heterostructure-based spintronic devices.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1038/S41467-021-25705-1
