相关参考文献
注意：仅列出部分参考文献，下载原文获取全部文献信息。
Article
Multidisciplinary Sciences
Harley D. Scammell et al.
Summary: Recent experiments on kagome metals AV(3)Sb(5) reveal the presence of twofold van Hove singularities (TvHS) near the Fermi energy, leading to the formation of two approximately hexagonal Fermi surfaces - one electron-like and the other hole-like. A TvHS is suggested to give rise to a novel time-reversal symmetry breaking excitonic order, caused by bound pairs of electrons and holes located at opposite concavity van Hove singularities. A minimal model for TvHS is introduced, and many-body instabilities induced by interactions are investigated using perturbative renormalisation group technique and free energy analysis. A phase diagram consisting of chiral excitons, charge density wave, and a coexistence region is constructed for the kagome metals AV(3)Sb(5), explaining various experimental observations. The chiral excitonic state leads to a quantum anomalous Hall conductance, providing an explanation for the observed anomalous Hall effect in kagome metals. Possible alternative realisations of the TvHS mechanism in bilayer materials are also discussed, suggesting that TvHS offer interesting possibilities for correlated phases, expanding the range of competing ground states to include excitonic order.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Mingu Kang et al.
Summary: The authors use high-resolution angle-resolved photoemission spectroscopy to determine the microscopic structure of three-dimensional charge order in AV(3)Sb(5) (A = K, Rb, Cs) and its interplay with superconductivity. The observed difference in charge order structure between CsV3Sb5 and the other compounds potentially explains the double-dome superconductivity in CsV3(Sb,Sn)(5) and the suppression of T-c in KV3Sb5 and RbV3Sb5. These findings provide fresh insights into the phase diagram of AV(3)Sb(5).
Review
Multidisciplinary Sciences
Kun Jiang et al.
Summary: This review discusses the recent progress on the experimental and theoretical studies of kagome superconductors AV(3)Sb(5), including the electronic properties, charge density wave state, time-reversal symmetry breaking, and superconducting properties. The authors aim to stimulate an expanded search for unconventional kagome superconductors.
NATIONAL SCIENCE REVIEW
(2023)
Article
Multidisciplinary Sciences
Linpeng Nie et al.
Summary: This study presents evidence for the existence of electronic nematicity in CsV3Sb5, providing new insights into the pairing mechanism in unconventional superconductors.
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
Mingu Kang et al.
Summary: This study combines angle-resolved photoemission spectroscopy and density functional theory to reveal the presence of multiple kagome-derived van Hove singularities (vHS) in CsV3Sb5 and their contribution to electronic symmetry breaking. These vHS critically determine the pairing symmetry and unconventional ground states emerging in the AV(3)Sb(5) series.
Article
Physics, Multidisciplinary
Hong Li et al.
Summary: Recently discovered AV(3)Sb(5) superconductors provide a fresh opportunity to study correlation-driven electronic phenomena on a kagome lattice. Using scanning tunnelling microscopy, researchers have found pronounced intensity anisotropy in the charge density wave of KV3Sb5, with one direction being distinctly different compared to the other two. Additionally, the CDW phase is unaffected by the magnetic-field direction, regardless of the presence or absence of atomic defects.
Article
Multidisciplinary Sciences
Hailan Luo et al.
Summary: This study reveals the electronic nature of the charge density wave (CDW) phase in Kagome superconductors AV(3)Sb(5). Through high-resolution angle-resolved photoemission measurements, CDW-induced Fermi surface reconstruction and band folding are observed, and the Fermi surface- and momentum-dependent CDW gap is measured, showing a strongly anisotropic CDW gap. Furthermore, the authors observe signatures of the electron-phonon coupling in KV3Sb5.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Yong Hu et al.
Summary: Enhanced correlation effects due to multiple van Hove singularities (VHS) in the vicinity of the Fermi level are predicted in the recently discovered AV(3)Sb(5) kagome metals. This study identifies three VHSs with diverse sublattice characters in CsV3Sb5, and reveals the flat dispersion of one VHS, suggesting its higher-order nature. The insights into the electronic structure provided by this work serve as a solid starting point for understanding the intriguing correlation phenomena in the kagome metals AV(3)Sb(5).
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yong Hu et al.
Summary: The recently discovered AV3Sb5 metals have attracted attention for their unique combination of superconductivity, charge density wave order, and nontrivial band topology. Despite intensive research efforts, the nature of the charge density wave order in these metals remains elusive. In this study, the electronic structure of AV3Sb5 is investigated using angle-resolved photoemission spectroscopy and density-functional theory calculations. The results provide insights into the dimensionality and pattern of the charge density wave order and its effects on the electronic structure, contributing to a better understanding of the exotic properties in these metals.
Article
Physics, Multidisciplinary
Cong Li et al.
Summary: Materials with a kagome lattice structure exhibit intriguing magnetic properties and have recently been found to possess topological and superconducting states. This study focuses on CsV3Sb5, a kagome superconductor, and uses angle-resolved photoemission spectroscopy to reveal the nature of its charge density wave (CDW). The results show that CsV3Sb5 displays intertwined CDW orders corresponding to two distinct types of distortions, the star of David and trihexagonal distortions.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Armando Consiglio et al.
Summary: In this study, the structural and electronic properties of kagome metals AV(3)Sb(5) (A = Cs, K, Rb) under isotropic and anisotropic pressure were investigated using first-principles calculations. The results show that the charge-ordering patterns are suppressed and there is a significant rearrangement of Van Hove point energies. The findings suggest a mechanism for tuning the correlation profile in kagome metals and provide insights for further experimental investigations on unconventional pairing and multidome superconductivity.
Article
Physics, Multidisciplinary
Daniele Guerci et al.
Summary: Twisted trilayer graphene (TTG) has recently been discovered as a fascinating platform to study correlated and exotic superconducting phases. It hosts a zero-energy higher-order Van Hove singularity that is stronger than predicted in twisted bilayer graphene, and this singularity can be tuned with only the twist angle and a perpendicular electric field. The emergence of this singularity is a result of the merging of Van Hove singularities and Dirac cones at zero energy, going beyond the recent classifications of Van Hove singularities in single-band models. This unique structure provides an unprecedented platform for studying correlation and superconductivity.
PHYSICAL REVIEW RESEARCH
(2022)
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
Xianxin Wu et al.
Summary: The recent discovery of AV(3)Sb(5) has revealed an intriguing arena for exotic Fermi surface instabilities in a kagome metal, with superconductivity near multiple van Hove singularities showing indications of unconventional pairing. The sublattice interference mechanism is crucial in understanding the formation of superconductivity in a kagome metal, with nonlocal Coulomb repulsion, the sublattice profile of the van Hove bands, and the interaction strength being crucial parameters determining the preferred pairing symmetry. Implications for potentially topological surface states are discussed, along with a proposal for additional measurements to determine the nature of superconductivity in AV(3)Sb(5).
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
Ying Xiang et al.
Summary: The authors report the two-fold rotational symmetry of superconductivity and signatures of an in-plane nematic electronic state in CsV3Sb5 under in-plane magnetic field. Interestingly, the two orders of superconductivity and nematic electronic state are orthogonal to each other in terms of the field direction of the minimum resistivity, shedding new light on understanding the physical properties of CsV3Sb5.
NATURE COMMUNICATIONS
(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
Physics, Multidisciplinary
Xu Chen et al.
Summary: This study demonstrates the superconducting performance and high robustness of structural stability of kagome CsV3Sb5 under high pressures, revealing the variation of Tc under different pressures. Changes in electronic structure and electron-phonon coupling may be responsible for the pressure-induced reentrant superconductivity.
CHINESE PHYSICS LETTERS
(2021)
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
Physics, Multidisciplinary
Hengxin Tan et al.
Summary: In this study, electronic and structural properties of the CDW phase in Kagome metals AV(3)Sb(5) were investigated using first-principles calculations. It was found that the CDW phase features an inverse Star of David structure, inherits nontrivial topological band structure, and has weak electron-phonon coupling indicating unconventional pairing mechanism for superconductivity. These results provide essential insights into the superconductivity and topology in Kagome metals.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
K. Y. Chen et al.
Summary: The study reveals that the CDW transition in CsV3Sb5 decreases with pressure, with an unusual M-shaped double dome in the T-c(P) curve showing enhancement up to 8 K at 2 GPa. This indicates a strong competition between CDW-like order and SC, particularly in the intermediate pressure range of P-c1 <= P <= P-c2.
PHYSICAL REVIEW LETTERS
(2021)
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
Harrison LaBollita et al.
Summary: The electronic structure of the new family of kagome metals AV(3)Sb(5) can be modified by pressure and hole doping, with pressure shifting saddle points away from the Fermi level and doping bringing them closer. This demonstrates how pressure and doping can be used to tune Fermi surface instabilities and associated orders.
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
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.
Article
Materials Science, Multidisciplinary
Zhuyi Zhang et al.
Summary: This study reports pressure-induced reemergence of superconductivity in CsV3Sb5, where the superconducting critical temperature initially increases and then decreases with pressure, forming a dome-shaped superconducting phase diagram. A new superconducting state emerges with further compression above 16.5 GPa, with T-c reaching a second maximum around 5.0 K and remaining stable up to 47.9 GPa. The reemergence of superconductivity in V-based superconductor is suggested to be attributed to a pressure-induced Lifshitz transition, supported by high-pressure synchrotron x-ray-diffraction measurements showing the stability of the pristine hexagonal phase up to 43.1 GPa.
Article
Chemistry, Physical
Arielle Little et al.
Article
Physics, Multidisciplinary
Brenden R. Ortiz et al.
PHYSICAL REVIEW LETTERS
(2020)
Article
Materials Science, Multidisciplinary
Yu-Ping Lin et al.
Article
Materials Science, Multidisciplinary
Laura Classen et al.
Article
Physics, Multidisciplinary
Wei Qin et al.
Article
Materials Science, Multidisciplinary
Brenden R. Ortiz et al.
PHYSICAL REVIEW MATERIALS
(2019)
Article
Physics, Multidisciplinary
Dmitry V. Efremov et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Noah F. Q. Yuan et al.
NATURE COMMUNICATIONS
(2019)
Article
Materials Science, Multidisciplinary
Domenico Di Sante et al.
Article
Materials Science, Multidisciplinary
Yu-Ping Lin et al.
Article
Physics, Multidisciplinary
Hiroki Isobe et al.
PHYSICAL REVIEW RESEARCH
(2019)
Article
Materials Science, Multidisciplinary
Matthias Hecker et al.
NPJ QUANTUM MATERIALS
(2018)
Article
Materials Science, Multidisciplinary
A. Shtyk et al.
Article
Materials Science, Multidisciplinary
Hong Yao et al.
Review
Physics, Condensed Matter
Annica M. Black-Schaffer et al.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2014)
Article
Physics, Multidisciplinary
Maximilian L. Kiesel et al.
PHYSICAL REVIEW LETTERS
(2013)
Article
Physics, Multidisciplinary
Rahul Nandkishore et al.
Article
Materials Science, Multidisciplinary
Wan-Sheng Wang et al.
Article
Materials Science, Multidisciplinary
Maximilian L. Kiesel et al.
Article
Materials Science, Multidisciplinary
Maximilian L. Kiesel et al.
Article
Physics, Multidisciplinary
Aline Ramires et al.
PHYSICAL REVIEW LETTERS
(2012)
Article
Physics, Multidisciplinary
Walter Metzner et al.
REVIEWS OF MODERN PHYSICS
(2012)
Review
Physics, Multidisciplinary
Karyn Le Hur et al.
