Magnon interactions in a moderately correlated Mott insulator
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arXiv
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2023
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| author | Wang, Qisi Mustafi, S. Fogh, E. Astrakhantsev, N. He, Z. Biało, I. Chan, Ying Martinelli, L. Horio, M. Ivashko, O. Shaik, N. E. von Arx, K. Sassa, Y. Paris, E. Fischer, M. H. Tseng, Y. Christensen, N. B. Galdi, A. Schlom, D. G. Shen, K. M. Schmitt, T. Rønnow, H. M. Chang, J. |
| author_facet | Wang, Qisi Mustafi, S. Fogh, E. Astrakhantsev, N. He, Z. Biało, I. Chan, Ying Martinelli, L. Horio, M. Ivashko, O. Shaik, N. E. von Arx, K. Sassa, Y. Paris, E. Fischer, M. H. Tseng, Y. Christensen, N. B. Galdi, A. Schlom, D. G. Shen, K. M. Schmitt, T. Rønnow, H. M. Chang, J. |
| contents | Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here we provide a resonant inelastic x-ray scattering study of magnon excitations in Mott insulating cuprates. From the thin film of SrCuO$_2$, single- and bi-magnon dispersions are derived. Using an effective Heisenberg Hamiltonian generated from the Hubbard model, we show that the single-magnon dispersion is only described satisfactorily when including significant quantum corrections stemming from magnon-magnon interactions. Comparative results on La$_2$CuO$_4$ indicate that quantum fluctuations are much stronger in SrCuO$_2$ suggesting closer proximity to a magnetic quantum critical point. Monte Carlo calculations reveal that other magnetic orders may compete with the antiferromagnetic Néel order as the ground state. Our results indicate that SrCuO$_2$ - due to strong quantum fluctuations - is a unique starting point for the exploration of novel magnetic ground states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_16553 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Magnon interactions in a moderately correlated Mott insulator Wang, Qisi Mustafi, S. Fogh, E. Astrakhantsev, N. He, Z. Biało, I. Chan, Ying Martinelli, L. Horio, M. Ivashko, O. Shaik, N. E. von Arx, K. Sassa, Y. Paris, E. Fischer, M. H. Tseng, Y. Christensen, N. B. Galdi, A. Schlom, D. G. Shen, K. M. Schmitt, T. Rønnow, H. M. Chang, J. Strongly Correlated Electrons Superconductivity Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here we provide a resonant inelastic x-ray scattering study of magnon excitations in Mott insulating cuprates. From the thin film of SrCuO$_2$, single- and bi-magnon dispersions are derived. Using an effective Heisenberg Hamiltonian generated from the Hubbard model, we show that the single-magnon dispersion is only described satisfactorily when including significant quantum corrections stemming from magnon-magnon interactions. Comparative results on La$_2$CuO$_4$ indicate that quantum fluctuations are much stronger in SrCuO$_2$ suggesting closer proximity to a magnetic quantum critical point. Monte Carlo calculations reveal that other magnetic orders may compete with the antiferromagnetic Néel order as the ground state. Our results indicate that SrCuO$_2$ - due to strong quantum fluctuations - is a unique starting point for the exploration of novel magnetic ground states. |
| title | Magnon interactions in a moderately correlated Mott insulator |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2311.16553 |