Dual structure in the charge excitation spectrum of electron-doped cuprates

Abstract

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 model with the long-range Coulomb interaction. We show that the spectrum is not dominated by a specific type of charge excitations, but by different kinds of charge fluctuations, and is characterized by a dual structure in the energy space. Low-energy charge excitations correspond to various types of bond-charge fluctuations driven by the exchange term (J-term) whereas high-energy charge excitations are due to usual on-site charge fluctuations and correspond to plasmon excitations above the particle-hole continuum. The interlayer coupling, which is frequently neglected in many theoretical studies, is particularly important to the high-energy charge excitations.

arXiv comment28 pages, 9 figures; [v3] slight change in title to match published version

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• Coupling between dynamic magnetic and charge-order correlations in the cuprate superconductor Nd${}_{2-x}$Ce${}_x$CuO${}_4$
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• Close inspection of plasmon excitations in cuprate superconductors
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• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase
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• Strong-coupling theory of bilayer plasmon excitations
• Strongly correlated model of acousticlike plasmons persisting across the phase diagram of cuprate superconductors
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors
• Theoretical perspectives on charge dynamics in high-temperature cuprate superconductors