Muhammad Zafur
;
Hiroyuki Yamase
(National Institute for Materials Science)
Collection
Citation
Description:
(abstract)Magnetic and bond-charge interactions can arise from the same microscopic interaction. Motivated by this observation, we compute magnetic and bond-charge excitation spectra on an equal footing by introducing a simple effective model on a square lattice, which describes antiferromagnetic and d-wave superconducting phases around half-filling on the electron-doped side. The magnetic excitation spectrum Im chi(q, omega) has strong weight around q=(pi, pi) in low energy and its intensity map exhibits a pencil-tip-like shape in q-omega space. Around q=(0,0) magnetic excitations show a steep dispersion toward the (pi, pi) and (pi,0) directions, which is very similar to a spin-wave dispersion although the system is non-magnetic. Bond-charge excitations are characterized by four different symmetries and studied for all possible couplings. Bond-charge fluctuations with three different symmetries have large spectral weight around q=(pi, pi) in a relatively low-energy region and extend widely more than the magnetic excitation spectrum. The d-wave symmetry of bond-charge excitations also has sizable spectral weight along the direction (pi/2, pi/2)-(0, 0)-(pi/2, 0) in a low-energy region and exhibits softening around q =(0.5 pi, 0), whereas no such softening is present in the other symmetries. We extend the present analysis to the hole-doped side and highlight a contrast to the electron-doped side, which includes incommensurate correlations, electronic nematic correlations, and spin and bond-charge resonance modes in the superconducting state.
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Keyword: spin excitations, bond-charge excitations, antiferromagnetic interaction , cuprate superconductors
Date published: 2024-06-20
Publisher: American Physical Society (APS)
Journal:
- Physical Review B (ISSN: 1550235X) vol. 109 issue. 24 245127
Funding:
- Japan Society for the Promotion of Science JP20H01856
- Ministry of Education, Culture, Sports, Science and Technology
Manuscript type: Author's version (Accepted manuscript)
MDR DOI: https://doi.org/10.48505/nims.4994
First published URL: https://doi.org/10.1103/physrevb.109.245127
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Updated at: 2024-11-19 16:31:15 +0900
Published on MDR: 2024-11-19 16:31:15 +0900