Doping evolution of the charge excitations and electron correlations in electron-doped superconducting La2−xCexCuO4

  title={Doping evolution of the charge excitations and electron correlations in electron-doped superconducting La2−xCexCuO4},
  author={Jiaqi Lin and Jie Yuan and Kuijuan Jin and Zhiping Yin and Gang Li and K. J. Zhou and Xingye Lu and Marcus Dantz and Thorsten Schmitt and Hong Ding and Haizhong Guo and Mark. P. M. Dean and Xuerong Liu},
  journal={npj Quantum Materials},
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$${}_{2-x}$$ 2 − x Ce$${}_{x}$$ x CuO$${}_{4}$$ 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… 
Electron self-energy from quantum charge fluctuations in the layered t−J model with long-range Coulomb interaction
Employing a large-N scheme of the layered t-J model with the long-range Coulomb interaction, which captures fine details of the charge excitation spectra recently observed in cuprate superconductors,
Close inspection of plasmon excitations in cuprate superconductors
Recently resonant inelastic x-ray scattering experiments reported fine details of the charge excitations around the in-plane momentum ${\bf q}_{\parallel}=(0,0)$ for various doping rates in
Post-growth annealing effects on charge and spin excitations in Nd2−xCexCuO4
We report a Cu K- and L$_3$-edge resonant inelastic x-ray scattering study of charge and spin excitations of bulk Nd$_{2-x}$Ce$_x$CuO$_4$, with focus on post-growth annealing effects. For the parent
Acoustic plasmons and conducting carriers in hole-doped cuprate superconductors
The superconductivity of cuprates, which has been a mystery ever since its discovery decades ago, is created through doping electrons or holes into a Mott insulator. There, however, exists an
Unified theory of spin and charge excitations in high- Tc cuprate superconductors: A quantitative comparison with experiment and interpretation
We provide a unified interpretation of both paramagnon and plasmon modes in high-Tc copperoxides, and verify it quantitatively against available resonant inelastic x-ray scattering (RIXS) data across
Robust spin and charge excitations throughout the high- Tc cuprate phase diagram from incipient Mottness
The generic phase diagram of lightly hole-doped high-$T_c$-cuprates hosts antiferromagnetic insulating phase with well-defined spin-wave excitations. Contrary to the weak-coupling prediction, these
Particle-hole asymmetry in the dynamical spin and charge responses of corner-shared 1D cuprates
Although many experiments imply that oxygen orbitals play an essential role in the high-temperature superconducting cuprates, their precise role in collective spin and charge excitations and
Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering.
Interestingly, in contrast to the quasistatic charge ordering which manifests at both Cu and O Sites, the observed acoustic plasmons are predominantly associated with the O sites, revealing a unique dichotomy in the behavior of valence charges in hole-doped cuprates.
The nature of plasmon excitations in hole-doped cuprate superconductors
High Tc superconductors show a rich variety of phases associated with their charge degrees of freedom. Valence charges can give rise to charge ordering or acoustic plasmons in these layered cuprate
Signatures of multiple charge excitations in resonant inelastic x-ray scattering spectra of metals
We study how multiple charge excitations appear in the resonant inelastic x-ray scattering (RIXS) spectra of metals. The single excitations in the problem are the plasmons and electron-hole pairs,


High-energy spin and charge excitations in electron-doped copper oxide superconductors.
X-ray and neutron inelastic X-ray scattering spectra show that magnetic excitations shift to higher energy upon doping, and they deeply mix with charge excitations, indicating that electrons acquire a highly itinerant character in the doped metallic state.
Spin and charge excitations in artificial hole- and electron-doped infinite layer cuprate superconductors
The asymmetry between electron and hole doping in high critical-temperature superconducting (HTS) cuprates is key information for the understanding of Cooper pair formation mechanisms. Despite
Crossover from Collective to Incoherent Spin Excitations in Superconducting Cuprates Probed by Detuned Resonant Inelastic X-Ray Scattering.
Beyond optimal doping, the RIXS data indicate a sharp crossover to a regime with a strong contribution from incoherent particle-hole excitations whose maximum shows a fluorescencelike shift upon detuning.
Momentum dependence of charge excitations in the electron-doped superconductor Nd1.85 Ce0.15 CuO4: a resonant inelastic x-ray scattering study.
A resonant inelastic x-ray scattering (RIXS) study of charge excitations in the electron-doped high-T(c) superconductor Nd1.85 Ce0.15 CuO4.15 shows a dispersion relation with q-dependent width emerges clearly in the intraband excitation, while the intensity of the interband excitation is concentrated around 2 eV near the zone center.
Collective nature of spin excitations in superconducting cuprates probed by resonant inelastic X-ray scattering.
These findings demonstrate that the largest fraction of the spin-flip RIXS profiles in doped cuprates arises from magnetic collective modes, rather than from incoherent particle-hole excitations as recently suggested theoretically.
Dual structure in the charge excitation spectrum of electron-doped cuprates
Motivated by the recent resonant x-ray scattering (RXS) and resonant inelastic x-ray scattering (RIXS) experiments in electron-doped cuprates, we study the charge excitation spectrum in a layered t-J
Incident-energy-dependent spectral weight of resonant inelastic x-ray scattering in doped cuprates
We theoretically investigate the incident-photon energy omega(i) dependence of resonant inelastic x-ray scattering (RIXS) tuned for the Cu L edge in cuprate superconductors by using the exact
Origin of high-energy charge excitations observed by resonant inelastic X-ray scattering in cuprate superconductors
The recent development of x-ray scattering techniques revealed the charge-excitation spectrum in high-Tc cuprate superconductors. While the presence of a dispersive signal in the high-energy
Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering
Resonant inelastic x-ray scattering (RIXS) tuned for the Cu L edge is a possible tool to detect charge excitations in cuprate superconductors. We theoretically investigate the possibility for
On the Theory of Plasmon Dispersion in Electron-Doped Cuprates
An explicit expression for the dynamic charge susceptibility for electron-doped cuprates has been derived. This expression accurately reproduces the wave vector dependence of the plasmon frequency