Spin and bond-charge excitation spectra in correlated electron systems near an antiferromagnetic phase

Muhammad Zafur; Hiroyuki Yamase

doi:10.1103/physrevb.109.245127

論文 Spin and bond-charge excitation spectra in correlated electron systems near an antiferromagnetic phase

Muhammad Zafur ; Hiroyuki Yamase (National Institute for Materials Science)

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Muhammad Zafur, Hiroyuki Yamase. Spin and bond-charge excitation spectra in correlated electron systems near an antiferromagnetic phase. Physical Review B. 2024, 109 (24), 245127. https://doi.org/10.1103/physrevb.109.245127

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(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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