Electron correlations and charge density wave in the topological kagome metal FeGe
ORAL
Abstract
Recently, a charge density wave was discovered in the magnetic binary kagome metal FeGe [1].
In analogy to its predecessor, the non-magnetic AV3Sb5 (A=K, Cs, Rb), the in-plane ordering
occurs at the M point. In contrast, however, the system manifestly shows effects of
substantial correlations. Here [2], we identify the topological bands crossing the Fermi energy in
FeGe and characterize the correlation-induced renormalization of these bands. We derive a
charge order from an effective model comprising topological kagome `flat' bands in the presence
of a magnetic order. We demonstrate edge states and excess out-of-plane magnetic moments
associated with the charge order; both are fingerprints of non-trivial band topology and
consistent with experimental observations [1,3]. Our results point to FeGe as an ideal platform to
realize and elucidate correlated topological physics.
Supported by the DOE BES Award # DE-SC0018197, LANL LDRD, UC Lab. Fees Research
Program, Quantum Science Center, a U.S. DOE Office of Science National QIS Research
Center, & CINT, a DOE BES user facility.
[1] X. Teng et al. Nature 609, 490 (2022)
[2] C. Setty et al., Electron correlations and charge density wave in the topological kagome metal
FeGe. arXiv:2203.01930.
[3] J. X. Yin et al., PRL 129, 166401 (2022)
In analogy to its predecessor, the non-magnetic AV3Sb5 (A=K, Cs, Rb), the in-plane ordering
occurs at the M point. In contrast, however, the system manifestly shows effects of
substantial correlations. Here [2], we identify the topological bands crossing the Fermi energy in
FeGe and characterize the correlation-induced renormalization of these bands. We derive a
charge order from an effective model comprising topological kagome `flat' bands in the presence
of a magnetic order. We demonstrate edge states and excess out-of-plane magnetic moments
associated with the charge order; both are fingerprints of non-trivial band topology and
consistent with experimental observations [1,3]. Our results point to FeGe as an ideal platform to
realize and elucidate correlated topological physics.
Supported by the DOE BES Award # DE-SC0018197, LANL LDRD, UC Lab. Fees Research
Program, Quantum Science Center, a U.S. DOE Office of Science National QIS Research
Center, & CINT, a DOE BES user facility.
[1] X. Teng et al. Nature 609, 490 (2022)
[2] C. Setty et al., Electron correlations and charge density wave in the topological kagome metal
FeGe. arXiv:2203.01930.
[3] J. X. Yin et al., PRL 129, 166401 (2022)
*Supported by the DOE BES Award # DE-SC0018197, LANL LDRD, UC Lab. Fees ResearchProgram, Quantum Science Center, a U.S. DOE Office of Science National QIS ResearchCenter, & CINT, a DOE BES user facility.
–
Publication: [1] X. Teng et al. Nature 609, 490 (2022)
[2] C. Setty et al., Electron correlations and charge density wave in the topological kagome metal
FeGe. arXiv:2203.01930.
[3] J. X. Yin et al., PRL 129, 166401 (2022)
Presenters
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Chandan Setty
- Rice University