Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Ultrafast RIXS of orbital-resolved valence-band reshaping in photoexcited graphite. |
| Συγγραφείς: |
Malvestuto, Marco1,2 marco.malvestuto@elettra.eu, Caretta, Antonio1, Laterza, Simone1, Bhardwaj, Richa1,3, Volpato, Beatrice4, Babici, Elena4, Brondin, Carlo Alberto5, Manfredda, Michele1, Simoncig, Alberto1, Zangrando, Marco1,2, Demidovich, Alexander1, Susnjar, Peter1, Allaria, Enrico Massimiliano1, Brynes, Alexander Darius1,6, Garzella, David1, Giannessi, Luca1, Ribič, Primož Rebernik1, Sottocorona, Filippo1, Zamolo, Matteo1, Hervat, Alessandro1 |
| Πηγή: |
Science Advances. 9/11/2026, Vol. 12 Issue 37, p1-13. 13p. |
| Θεματικοί όροι: |
*Time-resolved spectroscopy, *Electronic band structure, *Electron-phonon interactions, *Valence bands |
| Περίληψη: |
Ultrafast photoexcitation can drive solids far from equilibrium by dynamically renormalizing their electronic structure, yet direct time-domain access to bulk band-structure reshaping with orbital and momentum selectivity has remained limited. Here, we show in photoexcited graphite that femtosecond carbon K-edge resonant inelastic x-ray scattering (RIXS), used in the time domain, provides a momentum-and orbital-selective spectroscopic fingerprint of transient valence-band reshaping. Momentum-and orbital-selective measurements along the K → M contour disentangle p and s contributions and reveal a structured redistribution of spectral weight emerging within ~70 femtoseconds and evolving on picosecond timescales. Nonequilibrium first-principles RIXS calculations performed within a frozen-lattice approximation show that the earliest response is dominated by electronic correlations and transient screening. At longer delays, the dynamics become strongly momentum dependent: Near K, the signal reflects the decay of the electronic contribution to the renormalized band structure under a hot-phonon bottleneck, whereas at the M-point van Hove singularity, it reveals a characteristic spectroscopic signature consistent with electron-phonon-driven band red shift and lifetime broadening induced by strongly coupled optical phonons. A three-temperature model constrained by the orbital-resolved tr-RIXS data captures the ensuing energy cascade through a hot-phonon reservoir dominated by the E2g and A1' modes. These results establish time-domain RIXS as a complementary probe of transient band-structure renormalization and mode-selective energy flow in quantum materials. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: |
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