scholarly journals Topological quantum many-body scars in quantum dimer models on the kagome lattice

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Julia Wildeboer ◽  
Alexander Seidel ◽  
N. S. Srivatsa ◽  
Anne E. B. Nielsen ◽  
Onur Erten
Keyword(s):  
Kagome Lattice ◽  
Many Body ◽  
Kagomé Lattice ◽  
Topological Quantum ◽  
Dimer Models

scholarly journals A density-wave-like transition in the polycrystalline V3Sb2 sample with bilayer kagome lattice

2021 ◽  
Author(s):  
N. N. Wang ◽  
Y. H. Gu ◽  
M. A. McGuire ◽  
J. Q. Yan ◽  
L. F. Shi ◽  
...  
Keyword(s):  
Density Functional ◽  
Thermal Hysteresis ◽  
Density Wave ◽  
Density Functional Theory Calculations ◽  
Solid State Reaction Method ◽  
Kagome Lattice ◽  
Conventional Solid State Reaction ◽  
Kagomé Lattice ◽  
Preparation Conditions ◽  
Topological Quantum

Abstract Recently, transition-metal-based kagome metals have aroused much research interest as a novel platform to explore exotic topological quantum phenomena. Here we report on the synthesis, structure, and physical properties of a bilayer kagome lattice compound V3Sb2. The polycrystalline V3Sb2 samples were synthesized by conventional solid-state-reaction method in a sealed quartz tube at temperatures below 850 ℃. Measurements of magnetic susceptibility and resistivity revealed consistently a density-wave-like transition at T dw ≈ 160 K with a large thermal hysteresis, even though some sample-dependent behaviors are observed presumably due to the different preparation conditions. Upon cooling through T dw, no strong anomaly in lattice parameters and no indication of symmetry lowering were detected in powder x-ray diffraction measurements. This transition can be suppressed completely by applying hydrostatic pressures of about 1.8 GPa, around which no sign of superconductivity is observed down to 1.5 K. Specific-heat measurements reveal a relatively large Sommerfeld coefficient γ = 18.5 mJ/mol-K2, confirming the metallic ground state with moderate electronic correlations. Density functional theory calculations indicate that V3Sb2 shows a non-trivial topological crystalline property. Thus, our study makes V3Sb2 a new candidate of metallic kagome compound to study the interplay between density-wave-order, nontrivial band topology, and possible superconductivity.

scholarly journals Chern insulator with a nearly flat band in the metal-organic-framework-based Kagome lattice

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Santu Baidya ◽  
Seungjin Kang ◽  
Choong H. Kim ◽  
Jaejun Yu
Keyword(s):  
Density Functional ◽  
Metal Organic Framework ◽  
Chern Number ◽  
Flat Band ◽  
Kagome Lattice ◽  
Kagomé Lattice ◽  
Topological Quantum ◽  
Metal Organic ◽  
Fe Complexes ◽  
Carrier Doping

Abstract Based on first-principles density-functional theory (DFT) calculations, we report that the transition-metal bis-dithiolene, M3C12S12 (M = Mn and Fe), complexes can be a two-dimensional (2D) ferromagnetic insulator with nontrivial Chern number. Among various synthetic pathways leading to metal bis-dithiolenes, the simplest choice of ligand, Benzene-hexathiol, connecting metal cations to form a Kagome lattice is studied following the experimental report of time-reversal symmetric isostructural compound Ni3C12S12. We show sulfur and carbon-based ligands play the key role in making the complexes topologically nontrivial. An unusual topological quantum phase transition induced by the on-site Coulomb interaction brings a nearly flat band with a nonzero Chern number as the highest occupied band. With this analysis we explain the electronic structure of the class M3C12S12 and predict the existence of nearly flat band with nonzero Chern number and it can be a fractional Chern insulator candidate with carrier doping.

scholarly journals Doping Quantum Spin Liquids on the Kagome Lattice

2021 ◽  
pp. 2000126
Author(s):  
Cheng Peng ◽  
Yi‐Fan Jiang ◽  
Dong‐Ning Sheng ◽  
Hong‐Chen Jiang
Keyword(s):  
Quantum Spin ◽  
Spin Liquids ◽  
Kagome Lattice ◽  
Kagomé Lattice ◽  
Quantum Spin Liquids

On Computations of Topological Descriptors of Kagome Lattice

2021 ◽  
pp. 1-15
Author(s):  
Zahid Iqbal ◽  
Adnan Aslam ◽  
Muhammad Ishaq ◽  
Wei Gao
Keyword(s):  
Topological Descriptors ◽  
Kagome Lattice ◽  
Kagomé Lattice

scholarly journals Strain-Relief Patterns and Kagome Lattice in Self-Assembled C60 Thin Films Grown on Cd(0001)

2021 ◽  
Vol 22 (13) ◽  
pp. 6880
Author(s):  
Zilong Wang ◽  
Minlong Tao ◽  
Daxiao Yang ◽  
Zuo Li ◽  
Mingxia Shi ◽  
...  
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Scanning Tunneling ◽  
Kagome Lattice ◽  
Tunneling Microscopy ◽  
Kagomé Lattice ◽  
Temperature Scanning ◽  
C60 Films

We report an ultra-high vacuum low-temperature scanning tunneling microscopy (STM) study of the C60 monolayer grown on Cd(0001). Individual C60 molecules adsorbed on Cd(0001) may exhibit a bright or dim contrast in STM images. When deposited at low temperatures close to 100 K, C60 thin films present a curved structure to release strain due to dominant molecule–substrate interactions. Moreover, edge dislocation appears when two different wavy structures encounter each other, which has seldomly been observed in molecular self-assembly. When growth temperature rose, we found two forms of symmetric kagome lattice superstructures, 2 × 2 and 4 × 4, at room temperature (RT) and 310 K, respectively. The results provide new insight into the growth behavior of C60 films.

scholarly journals Flat-Band-Enabled Triplet Excitonic Insulator in a Diatomic Kagome Lattice

2021 ◽  
Vol 126 (19) ◽  
Author(s):  
Gurjyot Sethi ◽  
Yinong Zhou ◽  
Linghan Zhu ◽  
Li Yang ◽  
Feng Liu
Keyword(s):  
Flat Band ◽  
Kagome Lattice ◽  
Kagomé Lattice ◽  
Excitonic Insulator
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