Photo-generated charge-transfer excitons in NiO revealed by ultrafast time-resolved resonant inelastic x-ray scattering
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909589947023360 |
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| author | Merzoni, Giacomo Martinelli, Leonardo Parchenko, Sergii TenHuisen, Sophia F. R. Lebedev, Vasily Adriano, Luigi Carley, Robert Gerasimova, Natalia Mercadier, Laurent Teichmann, Martin van Kuiken, Benjamin E. Yin, Zhong Alic, Amina Baykusheva, Denitsa R. Chiuzbaian, Sorin G. Conte, Stefano Dal Dogadov, Oleg Föhlisch, Alexander Haverkort, Maurits W. Kusch, Maximilian Laarmann, Tim Lee, Wei Sheng Sala, Marco Moretti Peng, Ying Ying Qiu, Qing Zheng Schmitt, Thorsten Lalithambika, Sreeju Sreekantan Nair Techert, Simone Cerullo, Giulio Först, Michael Mitrano, Matteo Dean, Mark P. M. Schlappa, Justine Scherz, Andreas Ghiringhelli, Giacomo |
| author_facet | Merzoni, Giacomo Martinelli, Leonardo Parchenko, Sergii TenHuisen, Sophia F. R. Lebedev, Vasily Adriano, Luigi Carley, Robert Gerasimova, Natalia Mercadier, Laurent Teichmann, Martin van Kuiken, Benjamin E. Yin, Zhong Alic, Amina Baykusheva, Denitsa R. Chiuzbaian, Sorin G. Conte, Stefano Dal Dogadov, Oleg Föhlisch, Alexander Haverkort, Maurits W. Kusch, Maximilian Laarmann, Tim Lee, Wei Sheng Sala, Marco Moretti Peng, Ying Ying Qiu, Qing Zheng Schmitt, Thorsten Lalithambika, Sreeju Sreekantan Nair Techert, Simone Cerullo, Giulio Först, Michael Mitrano, Matteo Dean, Mark P. M. Schlappa, Justine Scherz, Andreas Ghiringhelli, Giacomo |
| contents | Strong electronic correlation can lead to insulating behavior and to the opening of large optical gaps, even in materials with partly filled valence shells. Although the non-equilibrium optical response encodes both local (quasi atomic) and collective (long range) responses, optical spectroscopy is usually more sensitive to the latter. Resonant x-ray techniques are better suited to investigate the quasi-atomic properties of correlated solids. Using time-resolved resonant inelastic x-ray scattering (RIXS), here we study the ultrafast non-equilibrium processes in NiO following photo-excitation by ultraviolet photons with energy exceeding the optical gap. We observe the creation of charge-transfer excitons that decay with a time constant of about 2\,ps, while itinerant photo-doping persists for tens of picoseconds. Following our discovery, which establishes time-resolved high-resolution RIXS as a powerful tool for the study of transient phenomena in condensed matter, the possible presence of charge-transfer excitons will need to be considered when interpreting optical pump-probe experiments on correlated quantum materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_16653 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Photo-generated charge-transfer excitons in NiO revealed by ultrafast time-resolved resonant inelastic x-ray scattering Merzoni, Giacomo Martinelli, Leonardo Parchenko, Sergii TenHuisen, Sophia F. R. Lebedev, Vasily Adriano, Luigi Carley, Robert Gerasimova, Natalia Mercadier, Laurent Teichmann, Martin van Kuiken, Benjamin E. Yin, Zhong Alic, Amina Baykusheva, Denitsa R. Chiuzbaian, Sorin G. Conte, Stefano Dal Dogadov, Oleg Föhlisch, Alexander Haverkort, Maurits W. Kusch, Maximilian Laarmann, Tim Lee, Wei Sheng Sala, Marco Moretti Peng, Ying Ying Qiu, Qing Zheng Schmitt, Thorsten Lalithambika, Sreeju Sreekantan Nair Techert, Simone Cerullo, Giulio Först, Michael Mitrano, Matteo Dean, Mark P. M. Schlappa, Justine Scherz, Andreas Ghiringhelli, Giacomo Strongly Correlated Electrons Strong electronic correlation can lead to insulating behavior and to the opening of large optical gaps, even in materials with partly filled valence shells. Although the non-equilibrium optical response encodes both local (quasi atomic) and collective (long range) responses, optical spectroscopy is usually more sensitive to the latter. Resonant x-ray techniques are better suited to investigate the quasi-atomic properties of correlated solids. Using time-resolved resonant inelastic x-ray scattering (RIXS), here we study the ultrafast non-equilibrium processes in NiO following photo-excitation by ultraviolet photons with energy exceeding the optical gap. We observe the creation of charge-transfer excitons that decay with a time constant of about 2\,ps, while itinerant photo-doping persists for tens of picoseconds. Following our discovery, which establishes time-resolved high-resolution RIXS as a powerful tool for the study of transient phenomena in condensed matter, the possible presence of charge-transfer excitons will need to be considered when interpreting optical pump-probe experiments on correlated quantum materials. |
| title | Photo-generated charge-transfer excitons in NiO revealed by ultrafast time-resolved resonant inelastic x-ray scattering |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.16653 |