Electron-hole asymmetry of quantum collective excitations in high-\(T_c\) copper oxides

We carry out a systematic study of collective spin- and charge excitations for the canonical single-band 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. Recently developed variational wav...

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Bibliographic Details
Published inarXiv.org
Main Author Fidrysiak, Maciej
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 13.03.2024
Subjects
Antiferromagnetism
Asymmetry
Copper oxides
Cuprates
Doping
Excitation
Hamiltonian functions
High temperature
Holes (electron deficiencies)
Inelastic scattering
Phase diagrams
Superconductors
Wave functions
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Summary:We carry out a systematic study of collective spin- and charge excitations for the canonical single-band 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. Recently developed variational wave function approach, combined with the expansion in 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 electron-doped side of the phase diagram.
ISSN:2331-8422
DOI:10.48550/arxiv.2210.16109