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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.13609 |
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| _version_ | 1866912279729012736 |
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| author | Huang, Qing Zhang, Hao Hao, Yiqing Yao, Weiliang Pajerowski, Daniel M. Aczel, Adam A. Choi, Eun Sang Barros, Kipton Normand, Bruce Zhou, Haidong Läuchli, Andreas M. Bai, Xiaojian Zhang, Shang-Shun |
| author_facet | Huang, Qing Zhang, Hao Hao, Yiqing Yao, Weiliang Pajerowski, Daniel M. Aczel, Adam A. Choi, Eun Sang Barros, Kipton Normand, Bruce Zhou, Haidong Läuchli, Andreas M. Bai, Xiaojian Zhang, Shang-Shun |
| contents | Pair condensates appear in multiple branches of physics, always introducing exotic phenomena. The pair condensate in quantum magnetism is the spin nematic, whose static (quadrupolar) order is difficult to access, favoring dynamical probes. Here, we perform high-resolution neutron spectroscopy to obtain direct evidence for the presence of two spin-nematic phases induced in the triangular-lattice antiferromagnet Na2BaNi(PO4)2 by controlling the applied magnetic field. By combining precise experiments with quantitative theoretical and numerical analysis, we identify universal dynamics arising from the pair condensate. We show explicitly how the gapless Goldstone mode influences the dispersion and induces Cherenkov-like velocity-selective decay of the gapped single-quasiparticle band. These common spectral features shed new light on spin-nematic dynamics and underline the universal phenomenology shared by pair condensates across different physical systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_13609 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Universal dynamics of a pair condensate Huang, Qing Zhang, Hao Hao, Yiqing Yao, Weiliang Pajerowski, Daniel M. Aczel, Adam A. Choi, Eun Sang Barros, Kipton Normand, Bruce Zhou, Haidong Läuchli, Andreas M. Bai, Xiaojian Zhang, Shang-Shun Strongly Correlated Electrons Pair condensates appear in multiple branches of physics, always introducing exotic phenomena. The pair condensate in quantum magnetism is the spin nematic, whose static (quadrupolar) order is difficult to access, favoring dynamical probes. Here, we perform high-resolution neutron spectroscopy to obtain direct evidence for the presence of two spin-nematic phases induced in the triangular-lattice antiferromagnet Na2BaNi(PO4)2 by controlling the applied magnetic field. By combining precise experiments with quantitative theoretical and numerical analysis, we identify universal dynamics arising from the pair condensate. We show explicitly how the gapless Goldstone mode influences the dispersion and induces Cherenkov-like velocity-selective decay of the gapped single-quasiparticle band. These common spectral features shed new light on spin-nematic dynamics and underline the universal phenomenology shared by pair condensates across different physical systems. |
| title | Universal dynamics of a pair condensate |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.13609 |