Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2

Abstract

The interplay between electronic correlations and topological protection may offer a rich avenue for discovering emergent quantum phenomena in condensed matter. However, electronic correlations have so far been little investigated in Weyl semimetals (WSMs) by experiments. Here, we report a combined optical spectroscopy and theoretical calculation study on the strength of electronic correlations in a kagome magnet Co3Sn2S2 and the influence of electronic correlations on its WSM state expected within a single-particle picture. The electronic kinetic energy estimated from our optical data is about half of that obtained from single-particle ab initio calculations, which indicates intermediate-strength electronic correlations in this system. Furthermore, comparing the energy ratios between the interband-transition peaks at high energies in the experimental and single-particle-ab-initio-calculation derived optical conductivity spectra with the electronic bandwidth renormalization factors obtained by many-body calculations enables us to estimate the Coulomb-interaction strength (U ~ 4 eV) of electronic correlations in Co3Sn2S2. Our many-body calculations with U ~ 4 eV show that a WSM state, which is characterized by bulk Weyl cones and surface Fermi arcs, survives in this correlated electron system. Besides, a sharp experimental optical conductivity peak at low energy, which is absent in the single-particle-ab-initio-calculation-derived optical conductivity spectrum but is consistent with the optical conductivity peaks obtained by many-body calculations, indicates that an electronic band connecting the two Weyl cones is flattened by electronic correlations and emerges near the Fermi energy in Co3Sn2S2. Our work paves the way for exploring flat-band-generated quantum phenomena in WSMs.

References in corpus (59)

• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• WannierTools: An open-source software package for novel topological materials
• Electronic Structure Calculations with Dynamical Mean-Field Theory: A Spectral Density Functional Approach
• Type-II Weyl Semimetals
• Weyl Semimetal in a Topological Insulator Multilayer
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Continuous-time Monte Carlo methods for quantum impurity models
• Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• High temperature fractional quantum Hall states
• Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal NbP
• Fractional quantum Hall states at zero magnetic field
• Observation of Weyl nodes in TaAs
• Mott physics and band topology in materials with strong spin-orbit interaction
• Nearly-flat bands with nontrivial topology
• Magnetic Weyl Semimetal Phase in a Kagome Crystal
• Topological Kondo Insulators
• Electrodynamics of Correlated Electron Materials
• Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2
• Topological Mott Insulators
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Superfluidity in topologically nontrivial flat bands
• Dynamical Mean-Field Theory within the Full-Potential Methods: Electronic structure of Ce-115 materials
• The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn
• Transport Properties of the Kondo Lattice Model in the Limit $S=\infty$ and $D=\infty$
• Electronic correlations in the iron pnictides
• Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2
• Fractional Quantum Hall Effect of Hard-Core Bosons in Topological Flat Bands
• Pseudospin exchange interactions in d^7 cobalt compounds: Possible realization of the Kitaev model
• Chiral anomaly, Charge Density Waves, and Axion Strings from Weyl Semimetals
• Topological surface Fermi arcs in the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Strongly Correlated Materials
• Weyl-Kondo Semimetal in Heavy Fermion Systems
• Tunable Berry Curvature Through Magnetic Phase Competition in a Topological Kagome Magnet
• Emergent space-time supersymmetry in 3D Weyl and 2D Dirac semimetals
• Giant anomalous Nernst effect in the magnetic Weyl semimetal Co3Sn2S2
• Interacting Weyl fermions: Phases, phase transitions and global phase diagram
• Correlation effects on 3D topological phases: from bulk to boundary
• Excitonic Phases from Weyl Semi-Metals
• Superconductivity from Flat Dispersion Designed in Doped Mott Insulators
• Optical Signatures of Dirac Nodal-lines in NbAs${}_2$
• Intrinsic anomalous Nernst effect amplified by disorder in a half-metallic semimetal
• $i$QIST: An open source continuous-time quantum Monte Carlo impurity solver toolkit
• Interacting Weyl semimetals: characterization via the topological Hamiltonian and its breakdown
• The two colors of MgB2
• Temperature-induced band shift in ferromagnetic Weyl semimetal Co3Sn2S2
• Signatures for half-metallicity and nontrivial surface states in a Kagome-lattice magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Density wave instabilities and surface state evolution in interacting Weyl semimetals
• Iron pnictide superconductors: Electrons on the verge
• Optical spectroscopy study on single crystalline LaFeAsO
• A Scaling Behavior of Spectral Weight Changes in Perovskite Manganites La_{0.7-y}Pr_{y}Ca_{0.3}MnO_3
• Weyl Semimetal in the Strong Coulomb Interaction Limit
• Topological density-wave states in a particle-hole symmetric Weyl metal
• Unidirectional Transport in Electronic and Photonic Weyl Materials by Dirac Mass Engineering
• Infrared properties of heavy-fermions: evolution from weak to strong hybridizations
• Spin-orbit driven spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2S2

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• Electronic structure and topology across $T_c$ in magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
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• Single pair of Weyl nodes in the spin-canted structure of EuCd${}_2$As${}_2$
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• Magneto-optical detection of topological contributions to the anomalous Hall effect in a kagome ferromagnet
• Electronic Correlations and Evolution of the Charge-Density Wave in the Kagome Metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
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• Unravelling the origin of the peculiar transition in the magnetically ordered phase of the Weyl semimetal Co3Sn2S2
• Signatures of van Hove singularities in the anisotropic in-plane optical conductivity of the topological semimetal Nb${}_3$SiTe${}_6$
• Magnetoresistance signature of two-dimensional electronic states in Co${}_3$Sn${}_2$S${}_2$
• Modulation of the Nernst Thermoelectrics by Regulating the Anomalous Hall and Nernst Angles
• Hubbard model on the kagome lattice with time-reversal invariant flux and spin-orbit coupling
• Light-induced anomalous Hall conductivity in massive 3D Dirac semimetal Co${}_3$Sn${}_2$S${}_2$
• Quantum oscillation studies of the nodal line semimetal Ni3In2S2-xSex
• Nodal line resonance generating the giant anomalous Hall effect of Co${}_3$Sn${}_2$S${}_2$
• Optical anisotropy of the kagome magnet FeSn: Dominant role of excitations between kagome and Sn layers
• Strong nonlinear optical response and transient symmetry switching in Type-II Weyl semimetal $\beta$-WP2
• $T_3$Pb${}_{2}C{h}_2$ ($T$=Pd,Pt and $Ch$=S,Se) with transition metal kagome net: Dynamical properties, phonon nodal line, phonon surface states, and chiral phonons
• Lattice dynamics study of electron-correlation-induced charge density wave in antiferromagnetic kagome metal FeGe
• On the Onsager-Casimir reciprocal relations in a tilted Weyl semimetal
• Highly anisotropic Drude-weight-reduction and enhanced linear-dichroism in van der Waals Weyl semimetal Td-MoTe2 with coherent interlayer electronic transport
• Infrared spectroscopy study of kagome material CsTi${}_3$Bi${}_5$
• Dirac node engineering and flat bands in doped Dirac materials
• Optical Signature of Flat Bands in Topological Hourglass Semimetal Nb3SiTe6
• Correlation stabilized ferromagnetic MnRuAs with distorted kagome lattice
• Quantum Hall Effect in a Weyl-Hubbard Model: Interplay between Topology and Correlation
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• Degenerate magnetic ground state and metastable state on trihexagonal Co-sublattices in Co3Sn2(S,Se)2 single crystals
• General ab initio framework for electronic-order-induced lattice-dynamics symmetry breaking
• Probing domain wall dynamics in magnetic Weyl semimetals via the non-linear anomalous Hall effect
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• Chiral electronic excitations and strong electron-phonon coupling to Weyl fermions in the Kagome semimetal Co${}_3$Sn${}_2$S${}_2$
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