Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

Yin, Jiaxin; Jiang, Yu-Xiao; Teng, Xiaokun; Hossain, Md. Shafayat; Mardanya, Sougata; Chang, Tay-Rong; Ye, Zijin; Xu, Gang; Denner, M. Michael; Neupert, Titus; Lienhard, Benjamin; Deng, Huanguang; Setty, Chandan; Si, Qimiao; Chang, Guoqing; Guguchia, Zurab; Gao, Bin; Shumiya, Nana; Zhang, Qi; Cochran, Tyler A.; Multer, Daniel; Yi, Ming; Dai, Pengcheng; Hasan, M. Zahid

doi:10.1103/physrevlett.129.166401

Cited by 58 publications

(53 citation statements)

References 44 publications

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“…At low temperatures, the energy difference is negative, but it changes sign at 80 K, where the phase transition takes place. This is close to the results of the latest experiments, , where the CDW transition is reported at 100–110 K. We further consider the energy barrier in the reaction pathway between the pristine and the 2 × 2 × 1 CDW phase in Figure f, where both phases are local minima in energy and the CDW phase shows slightly lower energy. There is an energy barrier of ∼3.06 meV/atom along the reaction path.…”

Section: Resultssupporting

confidence: 85%

Intertwining of Magnetism and Charge Ordering in Kagome FeGe

et al. 2023

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Recent experiments report a charge density wave (CDW) in the antiferromagnet FeGe, but the nature of the charge ordering and the associated structural distortion remains elusive. We discuss the structural and electronic properties of FeGe. Our proposed ground state phase accurately captures atomic topographies acquired by scanning tunneling microscopy. We show that the 2 × 2 × 1 CDW likely results from the Fermi surface nesting of hexagonal-prism-shaped kagome states. FeGe is found to exhibit distortions in the positions of the Ge atoms instead of the Fe atoms in the kagome layers. Using in-depth first-principles calculations and analytical modeling, we demonstrate that this unconventional distortion is driven by the intertwining of magnetic exchange coupling and CDW interactions in this kagome material. The movement of Ge atoms from their pristine positions also enhances the magnetic moment of the Fe kagome layers. Our study indicates that magnetic kagome lattices provide a material candidate for exploring the effects of strong electronic correlations on the ground state and their implications for transport, magnetic, and optical responses in materials.

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Section: Resultssupporting

confidence: 85%

Intertwining of Magnetism and Charge Ordering in Kagome FeGe

et al. 2023

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“…The unique kagome lattice is a two-dimensional network of corner-sharing triangles which have gained tremendous interests for studying the latent intriguing interplay of frustrated, correlated and topological nontrivial quantum electronic states [1][2][3][4][5][6] . Tight-binding models suggest that the electronic structure could host Dirac nodes, van Hove singularities and geometrically driven flat bands in kagome lattice 7,8 .…”

Section: Introductionmentioning

confidence: 99%

Optical studies of structural phase transition in the vanadium-based kagome metal ScV6Sn6

Hu¹,

Xu²,

Li³

et al. 2022

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In condensed matter physics, materials with kagome lattice exhibit exotic emergent quantum states, including charge density wave (CDW), superconductivity and magnetism. Very recently, hexagonal kagome metal ScV 6 Sn 6 was found to undergo fascinating first-order structural phase transition at around 92 K and a 3×3×3 CDW modulation. The bulk electronic band properties are enlightened for comprehending the origin of the structural phase transition. Here, we perform a optical spectroscopy study on the monocrystalline compound across the transition temperature. The structural transition gives rise to the abrupt changes of optical spectra without observing gap development behavior. The optical measurements revealed a sudden reconstruction of the band structure after transition. We emphasize that the phase transition is of the first order and distinctly different from the conventional density-wave type condensation. Our results provide insight into the origin of the structural phase transition in the new kagome metal compound.

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“…Such features are observed in many compounds in which kagome sublattice is realized [2][3][4][5][6][7]. Furthermore, such lattices support the emergence of the edge states, which are observed not only in solid state systems (such as multilayer silicene [2], GdV 6 Sn 6 [8] or FeGe [9]), but also in acoustic [10][11][12] or photonic [13][14][15] lattices.…”

Section: Introductionmentioning

confidence: 66%

$T_{3}$Pb$_{2}Ch_{2}$ ($T$=Pd,Pt and $Ch$=S,Se) with transition metal kagome net: Dynamical properties, phonon nodal line, phonon surface states, and chiral phonons

Basak¹,

Kobiałka²,

Ptok³

2023

Preprint

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Shandite with Ni3Pb2S2 chemical formula and R 3m symmetry, contains the kagome sublattice formed by the transition metal atoms. Recent experimental results confirmed the possibility of successfully synthesizing Pd3Pb2Ch2 (Ch=S,Se) with the same structure. In this paper, we theoretically investigate the dynamical properties of such compounds. Furthermore, we study the possibility of realizing Pt3Pb2Ch2 with the shandite structure. We show that the Pd3Pb2Ch2 and Pt3Pb2S2 are stable with R 3m symmetry. In the case of Pt3Pb2S2, there is a soft mode, which is the source of the structural phase transition from R 3m to R 3c symmetry, related to the distortion within the kagome sublattice. We discuss realized phonon nodal lines in the bulk phonon dispersions in upper frequency modes. We show that the shandite structure can host the phonon surface states, with strong dependence by the surface kind. Additionally, chiral phonons with circular motion of the Pb atoms around the equilibrium position are realized.

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Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

Cited by 58 publications

References 44 publications

Intertwining of Magnetism and Charge Ordering in Kagome FeGe

Intertwining of Magnetism and Charge Ordering in Kagome FeGe

Optical studies of structural phase transition in the vanadium-based kagome metal ScV6Sn6

$T_{3}$Pb$_{2}Ch_{2}$ ($T$=Pd,Pt and $Ch$=S,Se) with transition metal kagome net: Dynamical properties, phonon nodal line, phonon surface states, and chiral phonons

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