Hierarchical quasiparticle dynamics in antiferromagnets revealed by time- and momentum-resolved X-ray scattering
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| Format: | Preprint |
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2026
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| _version_ | 1866908833741275136 |
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| author | Romaguera, Arnau Skoropata, Elizabeth Yen, Yun Liu, Biaolong Nag, Abhishek Huang, Shih-Wen Leroy, Ludmila Moos, Katja Sophia Parusa, Gian Zerdane, Serhane Mandal, Ritwika Mariette, Celine Levantino, Matteo Paris, Eugenio Patthey, Luc Pomjakushina, Ekaterina Staub, Urs Hatnean, Monica Ciomaga Schueler, Michael Razzoli, Elia Ueda, Hiroki |
| author_facet | Romaguera, Arnau Skoropata, Elizabeth Yen, Yun Liu, Biaolong Nag, Abhishek Huang, Shih-Wen Leroy, Ludmila Moos, Katja Sophia Parusa, Gian Zerdane, Serhane Mandal, Ritwika Mariette, Celine Levantino, Matteo Paris, Eugenio Patthey, Luc Pomjakushina, Ekaterina Staub, Urs Hatnean, Monica Ciomaga Schueler, Michael Razzoli, Elia Ueda, Hiroki |
| contents | Energy flows among coupled subsystems are essential for ultrafast dynamics and high-speed technologies. In magnetic materials, spin fluctuations -- magnons -- mediate these flows in ultrafast magnetism. Yet momentum-resolved access to low-energy magnons governing the microscopic dynamics has been lacking. Using time-resolved resonant diffuse scattering alongside complementary time-resolved X-ray techniques and quantum-kinetic simulations, we unveil the hierarchical energy pathways among correlated systems in the photoexcited antiferromagnet CuO. Above-bandgap excitation triggers near-instantaneous spin disorder, generating non-thermal magnons throughout reciprocal space within femtoseconds. Real-time momentum-resolved tracking reveals picosecond magnon quasi-thermalization, followed by nanosecond recovery via momentum-selective magnon-phonon scattering. The quasiparticle dispersion mismatch creates recovery bottlenecks that control non-equilibrium lifetimes. This microscopic framework transcends phenomenological models and generalizes across materials, establishing design principles for ultrafast control of material properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_13113 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Hierarchical quasiparticle dynamics in antiferromagnets revealed by time- and momentum-resolved X-ray scattering Romaguera, Arnau Skoropata, Elizabeth Yen, Yun Liu, Biaolong Nag, Abhishek Huang, Shih-Wen Leroy, Ludmila Moos, Katja Sophia Parusa, Gian Zerdane, Serhane Mandal, Ritwika Mariette, Celine Levantino, Matteo Paris, Eugenio Patthey, Luc Pomjakushina, Ekaterina Staub, Urs Hatnean, Monica Ciomaga Schueler, Michael Razzoli, Elia Ueda, Hiroki Strongly Correlated Electrons Energy flows among coupled subsystems are essential for ultrafast dynamics and high-speed technologies. In magnetic materials, spin fluctuations -- magnons -- mediate these flows in ultrafast magnetism. Yet momentum-resolved access to low-energy magnons governing the microscopic dynamics has been lacking. Using time-resolved resonant diffuse scattering alongside complementary time-resolved X-ray techniques and quantum-kinetic simulations, we unveil the hierarchical energy pathways among correlated systems in the photoexcited antiferromagnet CuO. Above-bandgap excitation triggers near-instantaneous spin disorder, generating non-thermal magnons throughout reciprocal space within femtoseconds. Real-time momentum-resolved tracking reveals picosecond magnon quasi-thermalization, followed by nanosecond recovery via momentum-selective magnon-phonon scattering. The quasiparticle dispersion mismatch creates recovery bottlenecks that control non-equilibrium lifetimes. This microscopic framework transcends phenomenological models and generalizes across materials, establishing design principles for ultrafast control of material properties. |
| title | Hierarchical quasiparticle dynamics in antiferromagnets revealed by time- and momentum-resolved X-ray scattering |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.13113 |