Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering

Takami Tohyama; Kenji Tsutsui; Michiyasu Mori; Shigetoshi Sota; Seiji Yunoki

doi:10.1103/PhysRevB.92.014515

Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering

Strongly Correlated Electrons 2015-08-03 v2 Superconductivity

Authors: Takami Tohyama , Kenji Tsutsui , Michiyasu Mori , Shigetoshi Sota , Seiji Yunoki

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Abstract

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 observing a collective charge excitation by the RIXS. The RIXS process via the intermediate state inevitably makes the spectral weight of charge excitation stronger in electron doping than in hole doping. Electron-hole asymmetry also appears in the dynamical charge structure factor, showing a new enhanced small-momentum low-energy mode in electron doping. These facts indicate a possibility of detecting the new charge mode by RIXS in electron-doped systems.

Keywords

resonant inelastic x-ray scattering cuprate superconductors charge excitations electron doping spectral weight electron-hole asymmetry dynamical charge structure factor

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@article{arxiv.1503.04259,
  title  = {Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering},
  author = {Takami Tohyama and Kenji Tsutsui and Michiyasu Mori and Shigetoshi Sota and Seiji Yunoki},
  journal= {arXiv preprint arXiv:1503.04259},
  year   = {2015}
}

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8 pages, 7 figures, to appear in Phys. Rev. B

Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering

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