Abstract
The availability of ultrafast x-ray pulses both from powerful free electron laser light-sources as well as table top high-harmonic generation, has significantly enhanced the utility of core-level spectroscopies as probes for investigating dynamical processes in functional materials. Theoretical approaches to complement these time-domain experiments are therefore actively being developed. In this study we employ a combination of real-time time-dependent density functional theory (TDDFT), occupancy-constrained density functional theory and many-body perturbation theory approaches to help interpret spectral signatures observed in attosecond time-resolved core-level spectroscopic measurements on laser-excited silicon. Using non-equilibrium electron-hole densities obtained from real-time TDDFT simulations of the valence electronic structure we estimate the transient modulation of L-edge absorption in femtosecond infrared pump - attosecond XUV probe experiments. We further estimate the contribution of electron-phonon and electron-electron scattering mechanisms to the lifetime broadening observed in measured L-edge spectra using occupation-constrained density functional theory and GW calculations respectively.
Originalsprache | englisch |
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Titel | APS March Meeting 2015 |
Seiten | A15.001 |
Publikationsstatus | Veröffentlicht - März 2015 |
Extern publiziert | Ja |
Veranstaltung | APS March Meeting 2015 - San Antonio, Texas, USA / Vereinigte Staaten Dauer: 2 März 2015 → 6 März 2015 |
Konferenz
Konferenz | APS March Meeting 2015 |
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Land/Gebiet | USA / Vereinigte Staaten |
Ort | San Antonio, Texas |
Zeitraum | 2/03/15 → 6/03/15 |
Fields of Expertise
- Advanced Materials Science