Ultrafast Two-Dimensional Spectroscopy Uncovers Ubiquitous Electron-Paramagnon Coupling in Cuprate Superconductors
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2026
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866918420400832512 |
|---|---|
| author | Proietto, Francesco Milloch, Alessandra Franceschini, Paolo Azarm, Mohammadjavad Sellati, Niccolò Mishra, Rishabh Moen, Peter C. Smit, Steef Bluschke, Martin Greven, Martin Eisaki, Hiroshi Zonno, Marta Gorovikov, Sergey A. Dosanjh, Pinder Pagliara, Stefania Ferrini, Gabriele Boschini, Fabio Benfatto, Lara Ghiringhelli, Giacomo Parmigiani, Fulvio Davis, Jeffrey A. Damascelli, Andrea Giannetti, Claudio |
| author_facet | Proietto, Francesco Milloch, Alessandra Franceschini, Paolo Azarm, Mohammadjavad Sellati, Niccolò Mishra, Rishabh Moen, Peter C. Smit, Steef Bluschke, Martin Greven, Martin Eisaki, Hiroshi Zonno, Marta Gorovikov, Sergey A. Dosanjh, Pinder Pagliara, Stefania Ferrini, Gabriele Boschini, Fabio Benfatto, Lara Ghiringhelli, Giacomo Parmigiani, Fulvio Davis, Jeffrey A. Damascelli, Andrea Giannetti, Claudio |
| contents | The coupling between electronic excitations and collective bosonic modes is fundamental to the emergence of high-temperature superconductivity in cuprates. Despite extensive effort, conventional equilibrium and pump-probe optical spectroscopies still struggle to disentangle couplings to different bosonic modes when their energy scales overlap. Here we overcome this limitation using ultrafast two-dimensional electronic spectroscopy (2DES), which correlates coherent excitation and detection photon energies with femtosecond time resolution. Applied to optimally doped Bi$_2$Sr$_2$Ca$_{0.92}$Y$_{0.08}$Cu$_2$O$_{8+δ}$, 2DES reveals a pronounced off-diagonal resonance arising from the ultrafast generation of non-thermal bosons with energy $\hbarΩ_\mathbf{q}\simeq200$ meV. By comparing the measured spectra with a theoretical framework that explicitly includes the interaction between charge-transfer and magnetic excitations, we identify these bosons as paramagnons with momenta centered near $(π/2,π/2)$ and extending toward $(0,π)$ and $(π,0)$. The resonance persists across a large range of temperatures and doping concentrations, demonstrating that high-energy paramagnons are ubiquitously and strongly coupled to electronic excitations throughout the cuprate phase diagram. Time-domain analysis constrains the build-up of the paramagnon population to $\lesssim 10$ fs, placing a lower bound $λ\gtrsim 0.7$ on the coupling strength. More broadly, our results establish 2DES as a powerful approach for disentangling mode-selective electron-boson interactions and addressing decoherence dynamics, thereby establishing a new avenue for investigating strongly correlated quantum materials. These findings also provide a direct framework for future time-resolved resonant inelastic X-ray scattering experiments aimed at tracking the ultrafast dynamics of magnetic excitations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_29713 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrafast Two-Dimensional Spectroscopy Uncovers Ubiquitous Electron-Paramagnon Coupling in Cuprate Superconductors Proietto, Francesco Milloch, Alessandra Franceschini, Paolo Azarm, Mohammadjavad Sellati, Niccolò Mishra, Rishabh Moen, Peter C. Smit, Steef Bluschke, Martin Greven, Martin Eisaki, Hiroshi Zonno, Marta Gorovikov, Sergey A. Dosanjh, Pinder Pagliara, Stefania Ferrini, Gabriele Boschini, Fabio Benfatto, Lara Ghiringhelli, Giacomo Parmigiani, Fulvio Davis, Jeffrey A. Damascelli, Andrea Giannetti, Claudio Superconductivity The coupling between electronic excitations and collective bosonic modes is fundamental to the emergence of high-temperature superconductivity in cuprates. Despite extensive effort, conventional equilibrium and pump-probe optical spectroscopies still struggle to disentangle couplings to different bosonic modes when their energy scales overlap. Here we overcome this limitation using ultrafast two-dimensional electronic spectroscopy (2DES), which correlates coherent excitation and detection photon energies with femtosecond time resolution. Applied to optimally doped Bi$_2$Sr$_2$Ca$_{0.92}$Y$_{0.08}$Cu$_2$O$_{8+δ}$, 2DES reveals a pronounced off-diagonal resonance arising from the ultrafast generation of non-thermal bosons with energy $\hbarΩ_\mathbf{q}\simeq200$ meV. By comparing the measured spectra with a theoretical framework that explicitly includes the interaction between charge-transfer and magnetic excitations, we identify these bosons as paramagnons with momenta centered near $(π/2,π/2)$ and extending toward $(0,π)$ and $(π,0)$. The resonance persists across a large range of temperatures and doping concentrations, demonstrating that high-energy paramagnons are ubiquitously and strongly coupled to electronic excitations throughout the cuprate phase diagram. Time-domain analysis constrains the build-up of the paramagnon population to $\lesssim 10$ fs, placing a lower bound $λ\gtrsim 0.7$ on the coupling strength. More broadly, our results establish 2DES as a powerful approach for disentangling mode-selective electron-boson interactions and addressing decoherence dynamics, thereby establishing a new avenue for investigating strongly correlated quantum materials. These findings also provide a direct framework for future time-resolved resonant inelastic X-ray scattering experiments aimed at tracking the ultrafast dynamics of magnetic excitations. |
| title | Ultrafast Two-Dimensional Spectroscopy Uncovers Ubiquitous Electron-Paramagnon Coupling in Cuprate Superconductors |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2603.29713 |