Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913397861253120 |
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| author | Zafur, Muhammad Yamase, Hiroyuki |
| author_facet | Zafur, Muhammad Yamase, Hiroyuki |
| contents | 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 approx (0.5 pi, 0), whereas no such softening is present in the other symmetries. These results capture the essential features observed in electron-doped cuprates and may motivate an experimental test of bond-charge excitations around q=(pi, pi) on top of the strong magnetic excitations there as well as additional softening in the d-wave channel in the (pi, pi)-(pi/2, pi/2) region at low temperatures near the magnetic phase. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_02219 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase Zafur, Muhammad Yamase, Hiroyuki Strongly Correlated Electrons Superconductivity 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 approx (0.5 pi, 0), whereas no such softening is present in the other symmetries. These results capture the essential features observed in electron-doped cuprates and may motivate an experimental test of bond-charge excitations around q=(pi, pi) on top of the strong magnetic excitations there as well as additional softening in the d-wave channel in the (pi, pi)-(pi/2, pi/2) region at low temperatures near the magnetic phase. 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. |
| title | Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2404.02219 |