Energy density driven ultrafast electronic excitations in a cuprate superconductor
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911383536271360 |
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| author | Milloch, Alessandra Proietto, Francesco Agarwal, Naman Foglia, Laura Mincigrucci, Riccardo Gu, Genda Giannetti, Claudio Cilento, Federico Bencivenga, Filippo Parmigiani, Fulvio |
| author_facet | Milloch, Alessandra Proietto, Francesco Agarwal, Naman Foglia, Laura Mincigrucci, Riccardo Gu, Genda Giannetti, Claudio Cilento, Federico Bencivenga, Filippo Parmigiani, Fulvio |
| contents | Controlling nonequilibrium dynamics in quantum materials requires ultrafast probes with spectral selectivity. We report femtosecond reflectivity measurements on the cuprate superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ using free-electron laser extreme-ultraviolet (23.5--177~eV) and near-infrared (1.5~eV) pump pulses. EUV pulses access deep electronic states, while NIR light excites valence-band transitions. Despite these distinct channels, both schemes produce nearly identical dynamics: above $T_c$, excitations relax through fast (100--300~fs) and slower (1--5~ps) channels; below $T_c$, a delayed component signals quasiparticle recombination and condensate recovery. We find that when electronic excitations are involved, the ultrafast response is governed mainly by absorbed energy rather than by the microscopic nature of the excitation. In contrast, bosonic driving in the THz or mid-infrared produces qualitatively different dynamics. By demonstrating that EUV excitation of a correlated superconductor yields macroscopic dynamics converging with those from optical pumping, this work defines a new experimental paradigm: FEL pulses at core-level energies provide a powerful means to probe and control nonequilibrium electronic states in quantum materials on their intrinsic femtosecond timescales. This establishes FEL-based EUV pumping as a new capability for ultrafast materials science, opening routes toward soft X-ray and attosecond studies of correlated dynamics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_00653 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Energy density driven ultrafast electronic excitations in a cuprate superconductor Milloch, Alessandra Proietto, Francesco Agarwal, Naman Foglia, Laura Mincigrucci, Riccardo Gu, Genda Giannetti, Claudio Cilento, Federico Bencivenga, Filippo Parmigiani, Fulvio Superconductivity Strongly Correlated Electrons Controlling nonequilibrium dynamics in quantum materials requires ultrafast probes with spectral selectivity. We report femtosecond reflectivity measurements on the cuprate superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ using free-electron laser extreme-ultraviolet (23.5--177~eV) and near-infrared (1.5~eV) pump pulses. EUV pulses access deep electronic states, while NIR light excites valence-band transitions. Despite these distinct channels, both schemes produce nearly identical dynamics: above $T_c$, excitations relax through fast (100--300~fs) and slower (1--5~ps) channels; below $T_c$, a delayed component signals quasiparticle recombination and condensate recovery. We find that when electronic excitations are involved, the ultrafast response is governed mainly by absorbed energy rather than by the microscopic nature of the excitation. In contrast, bosonic driving in the THz or mid-infrared produces qualitatively different dynamics. By demonstrating that EUV excitation of a correlated superconductor yields macroscopic dynamics converging with those from optical pumping, this work defines a new experimental paradigm: FEL pulses at core-level energies provide a powerful means to probe and control nonequilibrium electronic states in quantum materials on their intrinsic femtosecond timescales. This establishes FEL-based EUV pumping as a new capability for ultrafast materials science, opening routes toward soft X-ray and attosecond studies of correlated dynamics. |
| title | Energy density driven ultrafast electronic excitations in a cuprate superconductor |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.00653 |