Origin of the high-energy charge excitations observed by resonant inelastic x-ray scattering in cuprate superconductors

Abstract

The recent development of x-ray scattering techniques revealed the charge-excitation spectrum in high-$T_c$ cuprate superconductors. While the presence of a dispersive signal in the high-energy charge-excitation spectrum is well accepted in the electron-doped cuprates, its interpretation and universality are controversial. Since charge fluctuations are observed ubiquitously in cuprate superconductors, the understanding of its origin is a pivotal issue. Here, we employ the layered $t$-$J$ model with the long-range Coulomb interaction and show that an acoustic-like plasmon mode with a gap at in-plane momentum (0,0) captures the major features of the high-energy charge excitations. The high-energy charge excitations, therefore, should be a universal feature in cuprate superconductors and are expected also in the hole-doped cuprates. Acoustic-like plasmons in cuprates have not been recognized yet in experiments. We propose several experimental tests to distinguish different interpretations of the high-energy charge excitations.

19 pages, 5 figures; Supplemental material included; to appear in Communications Physics

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Cited by in corpus (33)

• Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering
• Doping evolution of the charge excitations and electron correlations in electron-doped superconducting La${}_{2-x}$Ce${}_x$CuO${}_4$
• 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
• Algorithmic approach to diagrammatic expansions for real-frequency evaluation of susceptibility functions
• Evolution of plasmon excitations across the phase diagram of the cuprate superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• 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
• Plasmon dispersion in bilayer cuprate superconductors
• Charge Excitations in Nd${}_{2-x}$Ce${}_x$CuO${}_4$ Observed with Resonant Inelastic X-ray Scattering: Comparison of Cu K-edge with Cu L${}_3$-edge
• Superconductivity in the three-band model of cuprates: nodal direction characteristics and influence of intersite interactions
• 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
• Doping dependence of d-wave bond-charge excitations in electron-doped cuprates
• Feshbach hypothesis of high-Tc superconductivity in cuprates
• Unusual Low-Energy Collective Charge Excitations in High-$T_c$ Cuprate Superconductors
• Low-energy plasmon excitations in infinite-layer nickelates
• Magnon-assisted dynamics of a hole doped in a cuprate superconductor
• Plasmarons in high-temperature cuprate superconductors
• Post-growth annealing effects on charge and spin excitations in Nd${}_{2-x}$Ce${}_x$CuO${}_4$
• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase
• Charge density response in layered metals: retardation effects, generalized plasma waves and their spectroscopic signatures
• Retaining Landau quasiparticles in the presence of realistic charge fluctuations in cuprates
• Strong-coupling theory of bilayer plasmon excitations
• Mean Field Study of Superconductivity in the Square Lattice $t$-$J$ Model with Three-Site Hopping
• Possible zero sound in layered perovskites with ferromagnetic $s$-$d$ exchange interaction
• Anisotropic electron damping and energy gap in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors
• Theoretical perspectives on charge dynamics in high-temperature cuprate superconductors