Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn
<jats:title>Abstract</jats:title><jats:p>The 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 pla...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Springer Science and Business Media LLC
2022
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| Online Access: | https://hdl.handle.net/1721.1/141441 |
| _version_ | 1811093865567879168 |
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| author | Han, Minyong Inoue, Hisashi Fang, Shiang John, Caolan Ye, Linda Chan, Mun K Graf, David Suzuki, Takehito Ghimire, Madhav Prasad Cho, Won Joon Kaxiras, Efthimios Checkelsky, Joseph G |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Han, Minyong Inoue, Hisashi Fang, Shiang John, Caolan Ye, Linda Chan, Mun K Graf, David Suzuki, Takehito Ghimire, Madhav Prasad Cho, Won Joon Kaxiras, Efthimios Checkelsky, Joseph G |
| author_sort | Han, Minyong |
| collection | MIT |
| description | <jats:title>Abstract</jats:title><jats:p>The 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 SrTiO<jats:sub>3</jats:sub>, 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.</jats:p> |
| first_indexed | 2024-09-23T15:51:56Z |
| format | Article |
| id | mit-1721.1/141441 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:51:56Z |
| publishDate | 2022 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1414412023-01-20T16:47:34Z Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn Han, Minyong Inoue, Hisashi Fang, Shiang John, Caolan Ye, Linda Chan, Mun K Graf, David Suzuki, Takehito Ghimire, Madhav Prasad Cho, Won Joon Kaxiras, Efthimios Checkelsky, Joseph G Massachusetts Institute of Technology. Department of Physics <jats:title>Abstract</jats:title><jats:p>The 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 SrTiO<jats:sub>3</jats:sub>, 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.</jats:p> 2022-03-31T19:04:59Z 2022-03-31T19:04:59Z 2021 2022-03-31T18:42:18Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/141441 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). en 10.1038/S41467-021-25705-1 Nature Communications Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Science and Business Media LLC Nature |
| spellingShingle | Han, Minyong Inoue, Hisashi Fang, Shiang John, Caolan Ye, Linda Chan, Mun K Graf, David Suzuki, Takehito Ghimire, Madhav Prasad Cho, Won Joon Kaxiras, Efthimios Checkelsky, Joseph G Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn |
| title | Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn |
| title_full | Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn |
| title_fullStr | Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn |
| title_full_unstemmed | Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn |
| title_short | Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn |
| title_sort | evidence of two dimensional flat band at the surface of antiferromagnetic kagome metal fesn |
| url | https://hdl.handle.net/1721.1/141441 |
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