Magnetism and charge density wave order in kagome FeGe

Xiaokun Teng; Ji Seop Oh; Hengxin Tan; Lebing Chen; Jianwei Huang; Bin Gao; Jia Xin Yin; Jiun Haw Chu; Makoto Hashimoto; Donghui Lu; Chris Jozwiak; Aaron Bostwick; Eli Rotenberg; Garrett E. Granroth; Binghai Yan; Robert J. Birgeneau; Pengcheng Dai; Ming Yi

doi:10.1038/s41567-023-01985-w

Magnetism and charge density wave order in kagome FeGe

Xiaokun Teng, Ji Seop Oh, Hengxin Tan, Lebing Chen, Jianwei Huang, Bin Gao, Jia Xin Yin, Jiun Haw Chu, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Garrett E. Granroth, Binghai Yan, Robert J. Birgeneau, Pengcheng Dai, Ming Yi

Direct Geometry

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71 Scopus citations

Abstract

Electron correlations often lead to emergent orders in quantum materials, and one example is the kagome lattice materials where topological states exist in the presence of strong correlations between electrons. This arises from the features of the electronic band structure that are associated with the kagome lattice geometry: flat bands induced by destructive interference of the electronic wavefunctions, topological Dirac crossings and a pair of van Hove singularities. Various correlated electronic phases have been discovered in kagome lattice materials, including magnetism, charge density waves, nematicity and superconductivity. Recently, a charge density wave was discovered in the magnetic kagome FeGe, providing a platform for understanding the interplay between charge order and magnetism in kagome materials. Here we observe all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy. The presence of van Hove singularities near the Fermi level is driven by the underlying magnetic exchange splitting. Furthermore, we show spectral evidence for the charge density wave as gaps near the Fermi level. Our observations point to the magnetic interaction-driven band modification resulting in the formation of the charge density wave and indicate an intertwined connection between the emergent magnetism and charge order in this moderately correlated kagome metal.

Original language	English
Pages (from-to)	814-822
Number of pages	9
Journal	Nature Physics
Volume	19
Issue number	6
DOIs	https://doi.org/10.1038/s41567-023-01985-w
State	Published - Jun 2023

Funding

We thank J. Zhu, C. Lane, Q. Si and C. Setty for helpful discussions. The ARPES work is supported by the Gordon and Betty Moore Foundation’s EPiQS Initiative through grant no. GBMF9470 (M.Y.), Robert A. Welch Foundation grant no. C-2024 (M.Y.) and U.S. Department of Energy (DOE) grant bo. DE-SC0021421 (M.Y.). The neutron scattering and single-crystal synthesis work at Rice was supported by US NSF-DMR-2100741 (P.D.) and by the Robert A. Welch Foundation under grant no. C-1839 (P.D.), respectively. The work at the University of California, Berkeley was supported by the U.S. DOE under contract no. DE-AC02-05-CH11231 within the Quantum Materials Program (KC2202) (R.J.B.). This research used resources of the Advanced Light Source and the Stanford Synchrotron Radiation Lightsource, both U.S. DOE Office of Science User Facilities under contract nos. DE-AC02-05CH11231 and AC02-76SF00515, respectively. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by ORNL. B.Y. acknowledges financial support from the European Research Council (ERC Consolidator grant “NonlinearTopo”, no. 815869) and an ISF personal research grant (no. 2932/21). JSO acknowledges the support of the NSF Grants Nos. DMR-1921798 and DMR-1921847. We thank J. Zhu, C. Lane, Q. Si and C. Setty for helpful discussions. The ARPES work is supported by the Gordon and Betty Moore Foundation’s EPiQS Initiative through grant no. GBMF9470 (M.Y.), Robert A. Welch Foundation grant no. C-2024 (M.Y.) and U.S. Department of Energy (DOE) grant bo. DE-SC0021421 (M.Y.). The neutron scattering and single-crystal synthesis work at Rice was supported by US NSF-DMR-2100741 (P.D.) and by the Robert A. Welch Foundation under grant no. C-1839 (P.D.), respectively. The work at the University of California, Berkeley was supported by the U.S. DOE under contract no. DE-AC02-05-CH11231 within the Quantum Materials Program (KC2202) (R.J.B.). This research used resources of the Advanced Light Source and the Stanford Synchrotron Radiation Lightsource, both U.S. DOE Office of Science User Facilities under contract nos. DE-AC02-05CH11231 and AC02-76SF00515, respectively. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by ORNL. B.Y. acknowledges financial support from the European Research Council (ERC Consolidator grant “NonlinearTopo”, no. 815869) and an ISF personal research grant (no. 2932/21). JSO acknowledges the support of the NSF Grants Nos. DMR-1921798 and DMR-1921847.

Funders	Funder number
US NSF-DMR-2100741	C-1839
National Science Foundation	DMR-1921847, DMR-1921798
U.S. Department of Energy	DE-AC02-05CH11231, KC2202, AC02-76SF00515, DE-SC0021421
Welch Foundation	C-2024
Gordon and Betty Moore Foundation	GBMF9470
Office of Science
Oak Ridge National Laboratory
Iowa Science Foundation	2932/21
Engineering Research Centers	815869
European Research Council

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title = "Magnetism and charge density wave order in kagome FeGe",

abstract = "Electron correlations often lead to emergent orders in quantum materials, and one example is the kagome lattice materials where topological states exist in the presence of strong correlations between electrons. This arises from the features of the electronic band structure that are associated with the kagome lattice geometry: flat bands induced by destructive interference of the electronic wavefunctions, topological Dirac crossings and a pair of van Hove singularities. Various correlated electronic phases have been discovered in kagome lattice materials, including magnetism, charge density waves, nematicity and superconductivity. Recently, a charge density wave was discovered in the magnetic kagome FeGe, providing a platform for understanding the interplay between charge order and magnetism in kagome materials. Here we observe all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy. The presence of van Hove singularities near the Fermi level is driven by the underlying magnetic exchange splitting. Furthermore, we show spectral evidence for the charge density wave as gaps near the Fermi level. Our observations point to the magnetic interaction-driven band modification resulting in the formation of the charge density wave and indicate an intertwined connection between the emergent magnetism and charge order in this moderately correlated kagome metal.",

author = "Xiaokun Teng and Oh, {Ji Seop} and Hengxin Tan and Lebing Chen and Jianwei Huang and Bin Gao and Yin, {Jia Xin} and Chu, {Jiun Haw} and Makoto Hashimoto and Donghui Lu and Chris Jozwiak and Aaron Bostwick and Eli Rotenberg and Granroth, {Garrett E.} and Binghai Yan and Birgeneau, {Robert J.} and Pengcheng Dai and Ming Yi",

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AU - Teng, Xiaokun

AU - Oh, Ji Seop

AU - Tan, Hengxin

AU - Chen, Lebing

AU - Huang, Jianwei

AU - Gao, Bin

AU - Yin, Jia Xin

AU - Chu, Jiun Haw

AU - Hashimoto, Makoto

AU - Lu, Donghui

AU - Jozwiak, Chris

AU - Bostwick, Aaron

AU - Rotenberg, Eli

AU - Granroth, Garrett E.

AU - Yan, Binghai

AU - Birgeneau, Robert J.

AU - Dai, Pengcheng

AU - Yi, Ming

PY - 2023/6

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N2 - Electron correlations often lead to emergent orders in quantum materials, and one example is the kagome lattice materials where topological states exist in the presence of strong correlations between electrons. This arises from the features of the electronic band structure that are associated with the kagome lattice geometry: flat bands induced by destructive interference of the electronic wavefunctions, topological Dirac crossings and a pair of van Hove singularities. Various correlated electronic phases have been discovered in kagome lattice materials, including magnetism, charge density waves, nematicity and superconductivity. Recently, a charge density wave was discovered in the magnetic kagome FeGe, providing a platform for understanding the interplay between charge order and magnetism in kagome materials. Here we observe all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy. The presence of van Hove singularities near the Fermi level is driven by the underlying magnetic exchange splitting. Furthermore, we show spectral evidence for the charge density wave as gaps near the Fermi level. Our observations point to the magnetic interaction-driven band modification resulting in the formation of the charge density wave and indicate an intertwined connection between the emergent magnetism and charge order in this moderately correlated kagome metal.

AB - Electron correlations often lead to emergent orders in quantum materials, and one example is the kagome lattice materials where topological states exist in the presence of strong correlations between electrons. This arises from the features of the electronic band structure that are associated with the kagome lattice geometry: flat bands induced by destructive interference of the electronic wavefunctions, topological Dirac crossings and a pair of van Hove singularities. Various correlated electronic phases have been discovered in kagome lattice materials, including magnetism, charge density waves, nematicity and superconductivity. Recently, a charge density wave was discovered in the magnetic kagome FeGe, providing a platform for understanding the interplay between charge order and magnetism in kagome materials. Here we observe all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy. The presence of van Hove singularities near the Fermi level is driven by the underlying magnetic exchange splitting. Furthermore, we show spectral evidence for the charge density wave as gaps near the Fermi level. Our observations point to the magnetic interaction-driven band modification resulting in the formation of the charge density wave and indicate an intertwined connection between the emergent magnetism and charge order in this moderately correlated kagome metal.

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Magnetism and charge density wave order in kagome FeGe

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