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Article
Chemistry, Multidisciplinary
Jiawei Yu et al.
Summary: We report on in situ low-temperature scanning tunneling microscope measurements of atomic and electronic structures of the cleaved surfaces of an alkali-based kagome metal RbV3Sb5. The dominant pristine surface exhibits a unique unidirectional charge order. Rb desorption not only gives rise to hole doping but also reconstructs the electronic band structures, leading to a ubiquitous gap opening near the Fermi level in tunneling spectra.
Article
Multidisciplinary Sciences
C. Mielke et al.
Summary: The kagome lattice is a prominent structural motif in quantum physics that can host diverse quantum phases. Recent studies have shown that kagome superconductors exhibit unconventional chiral charge order, but direct evidence for time-reversal symmetry breaking is still lacking. Using muon spin relaxation, we observed an enhancement of the internal field width below the charge ordering temperature in KV3Sb5, indicating the presence of time-reversal symmetry-breaking charge order intertwining with unconventional superconductivity.
Article
Physics, Multidisciplinary
Titus Neupert et al.
Summary: Superconductivity and ordered states have been observed in a family of kagome materials, with lattice geometry, topological electron behavior, and competition between ground states playing key roles in determining material properties. The compounds KV3Sb5, CsV3Sb5, and RbV3Sb5 exhibit a kagome net of vanadium atoms, showing superconductivity at low temperatures and unusual charge order at high temperatures, connecting to the underlying topological nature of the band structure. This highlights the importance of these discoveries in the context of wider research efforts in topological physics and superconductivity, while also discussing open problems in this field.
Article
Physics, Multidisciplinary
Hao Huang et al.
Summary: In this study, the emergence of flat-band-dominated anomalous transport and magnetic behaviors in a paramagnetic kagome-lattice compound, CoSn, was demonstrated. The existence of a kagome-lattice-derived flat band was confirmed through measurements and calculations. The resistivity within the kagome lattice plane was found to be significantly larger than the interplane resistivity, and the magnetic susceptibility under the out-of-plane magnetic field was much smaller due to the introduction of unique orbital diamagnetism. These anomalous and giant anisotropies were attributed to the properties of flat-band electrons, such as large effective mass and self-localization of wave functions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Xiaokun Teng et al.
Summary: A hallmark of strongly correlated quantum materials is the rich phase diagram resulting from competing and intertwined phases. Recently, such rich phase diagrams have also been shown in correlated topological materials. This study reports the discovery of CDW in the antiferromagnetic ordered phase of kagome lattice FeGe, which is caused by the combination of electron-correlated AFM order and van Hove singularities-driven instability.
Article
Materials Science, Multidisciplinary
Huazhou Li et al.
Summary: Compounds with kagome lattice exhibit exotic quantum states and unconventional charge density wave states. Anomalous Hall effect suggests the presence of chiral flux current states. Scanning tunneling measurements confirm different ordered structures but do not observe the chiral flux current phase.
Article
Multidisciplinary Sciences
Hui Chen et al.
Summary: In this study, unconventional superconductivity and a pair density wave (PDW) were observed in CsV3Sb5, a vanadium-based kagome metal. The material exhibits a V-shaped pairing gap and a 3Q PDW, along with other unique characteristics such as strong-coupling superconductivity and charge order. These findings provide insights into the correlated electronic states and superconductivity in vanadium-based kagome metals.
Article
Multidisciplinary Sciences
He Zhao et al.
Summary: In a new kagome superconductor CsV3Sb5, temperature-dependent cascade of different symmetry-broken electronic states including tri-directional charge order and V-shaped spectral gap opening are discovered. Additional breaking of the six-fold rotational symmetry and presence of an additional 4a(0) unidirectional charge order through the superconducting transition are observed. The experiments reveal a complex landscape of electronic states on a kagome lattice, with intriguing parallels to high-Tc superconductors and twisted bilayer graphene.
Article
Physics, Multidisciplinary
Han-Shu Xu et al.
Summary: The study on the kagome superconductor CsV3Sb5 reveals multiband superconductivity, in-gap states induced by magnetic impurities, and different interactions between CDW and superconductivity on various bands. This provides critical clues for further understanding the relationship between superconductivity and CDW in CsV3Sb5.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
M. Michael Denner et al.
Summary: This article calculates the mechanism of electronically mediated charge density wave formation in kagome metals and finds that nematic chiral charge order is more likely. This helps to explain experimental results.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Xilin Feng et al.
Summary: The study identifies a chiral flux phase in the quasi-2D Kagome superconductor AV(3)Sb(5), which has the lowest energy and exhibits 2 x 2 charge orders observed experimentally. This phase breaks time-reversal symmetry and displays anomalous Hall effect.
Article
Chemistry, Physical
Yu-Xiao Jiang et al.
Summary: The study reveals an unconventional chiral charge order in KV3Sb5, a material with both a topological band structure and a superconducting ground state, using high-resolution scanning tunnelling microscopy. A 2 x 2 superlattice structure is observed in the experiment, along with an energy gap opening and charge modulation across the Fermi level.
Article
Multidisciplinary Sciences
C. L. Tschirhart et al.
Summary: Researchers have found that electrons in moire flat band systems can break time-reversal symmetry, leading to a quantized anomalous Hall effect, with magnetism primarily orbital in nature. The study also reveals a significant change in magnetization as the chemical potential crosses the quantum anomalous Hall gap, consistent with the expected contribution of chiral edge states to the magnetization in an orbital Chern insulator. Additionally, mapping the spatial evolution of field-driven magnetic reversal shows reproducible micrometer-scale domains pinned to structural disorder.
Article
Physics, Multidisciplinary
Zuowei Liang et al.
Summary: Transition-metal-based kagome metals offer a versatile platform for correlated topological phases with various electronic instabilities. The study of a newly discovered Z(2) topological kagome metal CsV3Sb5 with a superconducting ground state reveals charge modulation associated with the opening of an energy gap near the Fermi level. The findings suggest CsV3Sb5 as a promising candidate for realizing exotic excitations at the intersection of nontrivial lattice geometry, topology, and multiple electronic orders.
Article
Materials Science, Multidisciplinary
Zhiwei Wang et al.
Summary: This study reports the observation of electronic chiral charge order in CsV3Sb5 using scanning tunneling microscopy (STM). The research reveals the unique electronic nature of the chiral charge order, as well as the formation of domain walls in the 1 x 4 superlattice, possibly as a surface effect. Additionally, clean-limit superconductivity is observed through vortex core bound states within the superconducting energy gap under a c-axis magnetic field.
Article
Materials Science, Multidisciplinary
Takamori Park et al.
Summary: Electronic instabilities of a kagome metal with Fermi energy close to saddle points at the hexagonal Brillouin zone face centers were studied using parquet renormalization group, which determined superconducting, charge, orbital moment, and spin density waves. Landau theory was then applied to discuss how different primary density wave orders result in charge density wave modulations.
Article
Materials Science, Multidisciplinary
Nana Shumiya et al.
Summary: The study reveals the presence of chiral charge order and nematic surface superlattices in the superconductor RbV3Sb5 with kagome lattices, showing interactions between them that can be tuned by a magnetic field. Defects can introduce standing waves which couple with the charge order to cause extrinsic effects.
Article
Materials Science, Multidisciplinary
Yu-Ping Lin et al.
Summary: The study investigates the interaction between real and imaginary charge density waves at the Van Hove singularity on hexagonal lattices. It reveals the formation of 3Q complex orders and the rich phase diagram they constitute. The theoretical model offers transparent interpretations of experimental observations in kagome metals and sheds light on the nature of topological charge density waves.
Review
Physics, Applied
Jia-Xin Yin et al.
Summary: The search for topological phases of matter is moving towards strongly interacting systems like magnets and superconductors. Scanning tunnelling microscopy has become a powerful tool for probing and discovering emergent topological matter, with potential for providing new insights into topological matter at the atomic level in the future.
NATURE REVIEWS PHYSICS
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J-X Yin et al.
NATURE COMMUNICATIONS
(2020)
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Jia-Xin Yin et al.
NATURE COMMUNICATIONS
(2020)
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(2020)
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Yuqing Xing et al.
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Zhiyong Lin et al.
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Lang Peng et al.
NATURE COMMUNICATIONS
(2017)
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Z. F. Wang et al.
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Paolo Sessi et al.
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Christian Pauly et al.
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Fang Yang et al.
PHYSICAL REVIEW LETTERS
(2012)
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Di Xiao et al.
REVIEWS OF MODERN PHYSICS
(2010)
Review
Physics, Multidisciplinary
Roland Wiesendanger
REVIEWS OF MODERN PHYSICS
(2009)
