Doping evolution of the charge excitations and electron correlations in electron-doped superconducting La${}_{2-x}$Ce${}_x$CuO${}_4$

Abstract

Electron correlations play a dominant role in the charge dynamics of the cuprates. We use resonant inelastic x-ray scattering (RIXS) to track the doping dependence of the collective charge excitations in electron doped La${}_{2-x}$Ce${}_x$CuO${}_4$(LCCO). From the resonant energy dependence and the out-of-plane momentum dependence, the charge excitations are identified as three-dimensional (3D) plasmons, which reflect the nature of the electronic structure and Coulomb repulsion on both short and long length scales. With increasing electron doping, the plasmon excitations show monotonic hardening in energy, a consequence of the electron correlation effect on electron structure near the Fermi surface (FS). Importantly, the plasmon excitations evolve from a broad feature into a well defined peak with much increased life time, revealing the evolution of the electrons from incoherent states to coherent quasi-particles near the FS. Such evolution marks the reduction of the short-range electronic correlation, and thus the softening of the Mottness of the system with increasing electron doping.

References in corpus (34)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Electronic Structure Calculations with Dynamical Mean-Field Theory: A Spectral Density Functional Approach
• Resonant Inelastic X-ray Scattering Studies of Elementary Excitations
• Inelastic Light Scattering From Correlated Electrons
• Intense paramagnon excitations in a large family of high-temperature superconductors
• Doping dependence of an n-type cuprate superconductor investigated by ARPES
• Persistence of magnetic excitations in La2-xSrxCuO4 from the undoped insulator to the heavily overdoped non-superconducting metal
• Collective modes of the massless Dirac plasma
• Resonant X-rays at the Cu L-edge as a momentum dependent probe of the magnetic excitation spectrum in cuprates
• Energy and symmetry of $dd$ excitations in undoped layered cuprates measured by Cu $L_3$ resonant inelastic x-ray scattering
• Three dimensional collective charge excitations in electron-doped cuprate superconductors
• Asymmetry of collective excitations in electron and hole doped cuprate superconductors
• Spin excitations in a single La${}_2$CuO${}_4$ layer
• Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors
• Anomalous density fluctuations in a strange metal
• High-energy spin and charge excitations in electron-doped copper oxide superconductors
• Charge-density-waves and superconductivity as an alternative to phase separation in the infinite-U Hubbard-Holstein model
• High-energy magnetic excitations in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$: Towards a unified description of the electronic and magnetic degrees of freedom in the cuprates
• Electron Energy-Loss Spectroscopy: A versatile tool for the investigations of plasmonic excitations
• Momentum Dependence of Charge Excitations in the Electron-Doped Superconductor Nd1.85Ce0.15CuO4: a RIXS Study
• Insights into the High Temperature Superconducting Cuprates from Resonant Inelastic X-ray Scattering
• Plasmons in strongly correlated systems: spectral weight transfer and renormalized dispersion
• Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)
• Collective Charge Excitations of Strongly Correlated Electrons, Vertex Corrections and Gauge Invariance
• The Phase Diagram in Electron-Doped LCCO
• Plasmon excitations in layered high-Tc cuprates
• Observation of a dispersive charge mode in hole-doped cuprates using resonant inelastic x-ray scattering at the oxygen K edge
• Origin of the high-energy charge excitations observed by resonant inelastic x-ray scattering in cuprate superconductors
• Crossover from Collective to Incoherent Spin Excitations in Superconducting Cuprates Probed by Detuned Resonant Inelastic X-ray Scattering
• Raman and fluorescence characteristics of resonant inelastic X-ray scattering from doped superconducting cuprates
• RIXS studies of magnons and bimagnons in the lightly doped cuprate La2-xSrxCuO4
• Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering
• Dual structure in the charge excitation spectrum of electron-doped cuprates
• Incident-energy-dependent spectral weight of resonant inelastic x-ray scattering in doped cuprates

Cited by in corpus (43)

• Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering
• Superconductivity in high-$T_c$ and related strongly correlated systems from variational perspective: Beyond mean field theory
• Acoustic plasmons and conducting carriers in hole-doped cuprate superconductors
• Gapped collective charge excitations and interlayer hopping in cuprate superconductors
• Soft X-ray Spectroscopy of Low-Valence Nickelates
• Evolution of plasmon excitations across the phase diagram of the cuprate superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• Particle-hole asymmetry in the dynamical spin and charge structure factors of the corner-shared one-dimensional cuprates
• Generalized plasma waves in layered superconductors
• Close inspection of plasmon excitations in cuprate superconductors
• A unified theory of spin and charge excitations in high-$T_c$ cuprates: Quantitative comparison with experiment and interpretation
• Generalized Josephson plasmons in bilayer superconductors
• Plasmon dispersion in bilayer cuprate superconductors
• Robust spin and charge excitations throughout high-$T_c$-cuprate phase diagram from incipient Mottness
• Investigating Josephson plasmons in layered cuprates via nonlinear terahertz spectroscopy
• One- and two-particle properties of the weakly interacting two-dimensional Hubbard model in proximity to the van Hove singularity
• Electron self-energy from quantum charge fluctuations in the layered t-J model with long-range Coulomb interaction
• Impact of electron correlations on two-particle charge response in electron- and hole-doped cuprates
• Theoretical insights into electronic nematic order, bond-charge orders, and plasmons in cuprate superconductors
• Theory of charge dynamics in bilayer electron system with long-range Coulomb interaction
• Probing the bulk plasmon continuum of layered materials through electron energy loss spectroscopy in a reflection geometry
• Ring-like shaped charge modulations in the t-J model with long-range Coulomb interaction
• Unusual Low-Energy Collective Charge Excitations in High-$T_c$ Cuprate Superconductors
• Out-of-phase Plasmon Excitations in the Trilayer Cuprate Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$
• Ghost Josephson plasmon in bilayer superconductors
• Low-energy plasmon excitations in infinite-layer nickelates
• Universal collective modes from strong electronic correlations: Modified $1/{\mathcal{N}}_f$ theory with application to high-$T_c$ cuprates
• Post-growth annealing effects on charge and spin excitations in Nd${}_{2-x}$Ce${}_x$CuO${}_4$
• Plasmarons in high-temperature cuprate superconductors
• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase
• Optical absorption in tilted geometries as an indirect measurement of longitudinal plasma waves in layered cuprates
• Charge density response in layered metals: retardation effects, generalized plasma waves and their spectroscopic signatures
• Collective spin and charge excitations in the $t$-$J$-$U$ model of high-$T_c$ cuprates
• Evolution of the magnetic excitations in electron-doped ${\mathrm{La}}_{2-x}{\mathrm{Ce}}_x{\mathrm{CuO}}_4$
• Dynamic charge order from strong correlations in the cuprates
• Retaining Landau quasiparticles in the presence of realistic charge fluctuations in cuprates
• Phase separation and pairing fluctuations in oxide materials
• Signatures of multiple charge excitations in RIXS spectra of metals
• Polarization dependency in Resonant Inelastic X-Ray Scattering
• A light-induced charge order mode in a metastable cuprate ladder
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors
• Strongly correlated model of acousticlike plasmons persisting across the phase diagram of cuprate superconductors
• Observation of correlated plasmons in low-valence nickelates
• Collective Magnetic Excitations in a Photo-excited Electron-doped Cuprate Superconductor