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- Title
Electron-Hole Asymmetry of Quantum Collective Excitations in High-T<sub>c</sub> Copper Oxides.
- Authors
FIDRYSIAK, M.
- Abstract
We carry out a systematic study of collective spin and charge excitations for the canonical singleband Hubbard, t-J-U, and t-J models of high-temperature copper-oxide superconductors, both on electron- and hole-doped side of the phase diagram. A recently developed variational wave function approach, combined with the expansion in the inverse number of fermionic flavors, is employed. All three models exhibit a substantial electron-hole asymmetry of magnetic excitations, with a robust paramagnon emerging for hole-doping, in agreement with available resonant inelastic X-ray scattering data for the cuprates. The t-J model yields additional high-energy peak in the magnetic spectrum that is not unambiguously identified in spectroscopy. For all considered Hamiltonians, the dynamical charge susceptibility contains a coherent mode for both hole- and electron doping, with overall bandwidth renormalization controlled by the on-site Coulomb repulsion. Away from the strong-coupling limit, the antiferromagnetic ordering tendency is more pronounced on the electron-doped side of the phase diagram.
- Subjects
SPIN excitations; CUPRATES; HIGH temperature superconductors; X-ray scattering; INELASTIC scattering; PHASE diagrams; WAVE functions; ASYMMETRY (Chemistry); ELECTRON configuration
- Publication
Acta Physica Polonica: A, 2023, Vol 143, Issue 2, p180
- ISSN
0587-4246
- Publication type
Article
- DOI
10.12693/APhysPolA.143.180