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Article
Physics, Multidisciplinary
Feng Du et al.
Summary: This study reveals that applying moderate pressure can suppress charge order and enhance the superconducting transition temperature, but further increasing pressure weakens the transition temperature. The presence of a second superconducting dome is also observed, which is linked to high-pressure resistance anomalies.
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
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
Materials Science, Multidisciplinary
Tommy Li et al.
Summary: We discuss a pairing mechanism in interacting two-dimensional multipartite lattices that leads to a second order topological superconducting state with a spatially modulated gap. When the chemical potential is close to Dirac points, oppositely moving electrons on the Fermi surface undergo an interference phenomenon in which the Berry phase converts a repulsive electron-electron interaction into an effective attraction. The topology of the superconducting phase manifests as gapped edge modes in the quasiparticle spectrum and Majorana Kramers pairs at the corners.
Article
Physics, Multidisciplinary
Alexander A. Tsirlin et al.
Summary: The pressure evolution of the superconducting kagome metal CsV3Sb5 is studied using experimental and computational methods. The results show that pressure leads to a highly anisotropic compression due to the fast shrinkage of the Cs-Sb distances and suppression of Cs rattling motion. Additionally, it is found that Sb atoms play a central role in stabilizing the three-dimensional charge-density wave and Fermi surface reconstruction.
Article
Materials Science, Multidisciplinary
Harley D. Scammell et al.
Summary: In this study, the superconducting phase in a heterostructure of mirror-symmetric twisted trilayer graphene and WSe2 was found to exhibit a zero-field superconducting diode effect, which has been investigated and explained with a microscopic theory. The findings not only contribute to the understanding of the physics of trilayer graphene on WSe2, but also provide guidance for future experiments in spin-orbit-coupled graphene moire systems.
Article
Materials Science, Multidisciplinary
Yuzki M. Oey et al.
Summary: The unconventional coupling between CDW and superconducting states in CsV3Sb5-xSnx materials was studied. With hole doping, superconductivity shows a nonmonotonic evolution, while the CDW order is rapidly suppressed.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ritu Gupta et al.
Summary: The recently discovered kagome superconductor CsV3Sb5 exhibits multi-band nature and anisotropic superconducting properties with a two-gap (s + s)-wave symmetry, while maintaining time reversal symmetry.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Jiang-Xiazi Lin et al.
Summary: A superconducting diode effect is observed in twisted trilayer graphene at zero magnetic field, indicating the coexistence of superconductivity and time-reversal symmetry breaking. This non-reciprocal behavior can be controlled by adjusting carrier density, twist angle, or applying a magnetic field.
Article
Multidisciplinary Sciences
Haitao Yang et al.
Summary: The synthesis of Ti-substituted CsV3Sb5 single crystals and the mapping of its phase diagram reveal the evolution of intertwining electronic states in this kagome system. Two distinct superconductivity phases were observed upon substitution, with different characteristics such as unconventional gap shapes and the presence or absence of CDWs. The study also explores the effects of chemical substitution with other elements such as Cr and Nb on the superconductivity phases and CDWs. These findings provide insights into the tuning of correlated electronic states and superconducting pairing in kagome superconductors.
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
Materials Science, Multidisciplinary
C. C. Zhu et al.
Summary: We conducted high-pressure resistance measurements on V-based superconductors AV3Sb5 and discovered that they exhibit double-dome superconductivity. The strength and behavior of the superconducting domes are influenced by the ionic radius of the intercalated alkali-metal atoms.
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, Condensed Matter
Eric M. Kenney et al.
Summary: Muon spin relaxation and rotation measurements on the newly discovered kagome metal KV3Sb5 reveal a local field dominated by weak magnetic disorder associated with nuclear moments and showing a modest temperature dependence consistent with bulk magnetic susceptibility. The absence of evidence for V4+ local moments suggests that further studies are needed to understand the physics underlying the recently reported giant unconventional anomalous Hall effect in this material.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
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
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
Materials Science, Multidisciplinary
Brenden R. Ortiz et al.
Summary: This study reports the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal KV3Sb5, with further characterization of the normal state as a Z(2) topological metal using density functional theory (DFT) calculations. The presence of superconductivity in the AV(3)Sb(5) (A: K, Rb, Cs) family of compounds suggests a common feature across these materials, establishing them as a rich arena for studying the interplay between bulk superconductivity, topological surface states, and likely electronic density wave order in an exfoliable kagome lattice.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Multidisciplinary
Qiangwei Yin et al.
Summary: The discovery of superconductivity in RbV3Sb5 single crystals with V kagome lattice is reported, showing a superconducting transition at around 0.92K. Anomalies in properties at T* around 102-103K are observed, possibly linked to the formation of a charge ordering state. The drastic change and sign reversal of the Hall coefficient R-H at T* can be partially explained by enhanced mobility of hole-type carriers, with quantum oscillations indicating the presence of small Fermi surfaces with low effective mass.
CHINESE PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Shunli Ni et al.
Summary: The high-quality CsV3Sb5 single crystals exhibit excellent superconducting and mixed state properties, with a significant anisotropic ratio of Hc2(ab)/Hc2(c) and Hc1(ab)/Hc1(c) larger than 1. The orientation of the two-fold anisotropy in in-plane angular-dependent magnetoresistance displays a unique twist characteristic of the Kagome geometry at a characteristic temperature of around 2.8 K.
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
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
Weiyin Duan et al.
Summary: CsV3Sb5 exhibits nodeless superconductivity consistent with two-gap s-wave superconductivity description, and is confirmed under multiple Fermi surfaces.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Materials Science, Multidisciplinary
H. Miao et al.
Summary: The Kagome lattice is a rich platform for studying topological and intertwined electronic excitations, with recent experimental evidence of an unconventional charge density wave in AV(3)Sb(5) triggering interest in the interplay between frustrated crystal structures and Fermi surface instabilities. Analysis of lattice effects in AV(3)Sb(5) shows that the 2x2x2 CDW breaks the crystal's sixfold rotational symmetry and explains the observed CDW peak intensity, emphasizing the fundamental role of lattice geometry in understanding unconventional electronic orders. The coupling between lattice and electronic degrees of freedom leads to a weak first-order structural transition without continuous changes in lattice dynamics.
Article
Materials Science, Multidisciplinary
Tiema Qian et al.
Summary: This paper investigates the effect of uniaxial strains along the crystalline a axis on the kagome superconductor CsV3Sb5, revealing a strong competition between the superconducting transition temperature Tc and the charge-density wave transition temperature T-CDW. The study shows that Tc monotonically increases with increasing strain while T-CDW decreases, highlighting the importance of the c-axis lattice parameter as a tuning knob for the phase diagram of CsV3Sb5.
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.
Article
Materials Science, Multidisciplinary
Feng Du et al.
Summary: The study on KV3Sb5 reveals that with increasing pressure, the charge order progressively weakens and the superconducting transition temperature undergoes different degrees of changes. A superconducting dome is formed at around 10 GPa, while a smaller superconducting dome emerges beyond 10 GPa.
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
Materials Science, Multidisciplinary
Xuzhe Ying et al.
Summary: The study discusses the anomalous Hall effect and current switching mechanism of valley polarization in twisted bilayer graphene aligned with hexagonal boron nitride. It emphasizes the crucial role of intervalley scattering and estimates a significant enhancement of the effect in the magic angle regime.
Review
Physics, Applied
Jianpeng Liu et al.
Summary: The study of moire graphene systems has attracted considerable attention due to their exotic phenomena, which are closely related to valley-spin-degenerate and topologically non-trivial flat bands. Experimental evidence suggests that unconventional orbital magnetism is exhibited when time-reversal symmetry is broken spontaneously in these systems. Theoretical perspectives on the correlated insulating states and quantum anomalous Hall phenomena are discussed in this Perspective, emphasizing the topological nature of moire flat bands.
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