Bimagnon dispersion of La2CuO4 probed by resonant inelastic X-ray scattering
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908574409555968 |
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| author | Singh, A. Huang, H. Y. Tsutsui, K. Tohyama, T. Komiya, S. Okamoto, J. Chen, C. T. Fujimori, A. Huang, D. J. |
| author_facet | Singh, A. Huang, H. Y. Tsutsui, K. Tohyama, T. Komiya, S. Okamoto, J. Chen, C. T. Fujimori, A. Huang, D. J. |
| contents | We report on the study of the magnetic excitations of Mott insulator La2CuO4 by using resonant inelastic x-ray scattering (RIXS) and cluster calculations within the framework of exact diagonalization. Our results demonstrate experimentally that the bimagnon excitation in Cu L-edge RIXS is enhanced if the incident x-ray energy is slightly above the absorption edge. Through incident-energy-dependent momentum-resolved RIXS, we investigated the excitation of the bimagnon with predominantly A1 symmetry. The bimagnons of La2CuO4 exhibit a nearly flat dispersion with momentum along the Cu-O bond direction. This observation agrees with the bimagnon dispersion from the calculations on a single-band Hubbard model rather than a Heisenberg model with only the nearest neighbor exchange interaction. This means that the effect of the higher-order spin couplings such as the cyclic or ring exchange interactions caused by the coherent motion of electrons beyond nearest-neighbor sites is important for understanding the bimagnon dynamics of cuprates. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_02772 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bimagnon dispersion of La2CuO4 probed by resonant inelastic X-ray scattering Singh, A. Huang, H. Y. Tsutsui, K. Tohyama, T. Komiya, S. Okamoto, J. Chen, C. T. Fujimori, A. Huang, D. J. Strongly Correlated Electrons Superconductivity We report on the study of the magnetic excitations of Mott insulator La2CuO4 by using resonant inelastic x-ray scattering (RIXS) and cluster calculations within the framework of exact diagonalization. Our results demonstrate experimentally that the bimagnon excitation in Cu L-edge RIXS is enhanced if the incident x-ray energy is slightly above the absorption edge. Through incident-energy-dependent momentum-resolved RIXS, we investigated the excitation of the bimagnon with predominantly A1 symmetry. The bimagnons of La2CuO4 exhibit a nearly flat dispersion with momentum along the Cu-O bond direction. This observation agrees with the bimagnon dispersion from the calculations on a single-band Hubbard model rather than a Heisenberg model with only the nearest neighbor exchange interaction. This means that the effect of the higher-order spin couplings such as the cyclic or ring exchange interactions caused by the coherent motion of electrons beyond nearest-neighbor sites is important for understanding the bimagnon dynamics of cuprates. |
| title | Bimagnon dispersion of La2CuO4 probed by resonant inelastic X-ray scattering |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2510.02772 |