Probing Electronic Fluxes via Time-Resolved X-Ray Scattering
Gunter Hermann1,2,3, Vincent Pohl1,2,3, Gopal Dixit2
1Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, D-14195 Berlin, Germany.
Physical Review Letters
|January 25, 2020
Summary
Time-resolved X-ray scattering reveals electronic current flux density, mapping electron momentum and ultrafast charge migration. This technique provides insights into electron flow and coherence timescales in non-equilibrium systems.
Area of Science:
- Condensed Matter Physics
- Ultrafast Spectroscopy
- Materials Science
Background:
- Current flux density theoretically describes electron flow in non-equilibrium systems.
- Time-resolved X-ray scattering (TRX) is a powerful tool for probing dynamic electronic processes.
Purpose of the Study:
- To demonstrate that TRX signals encode information about electronic current flux density.
- To show how current flux density reveals mechanisms of ultrafast charge migration.
Main Methods:
- Utilizing time-resolved X-ray scattering (TRX) experiments.
- Analyzing TRX signals to extract electronic current flux density information.
Main Results:
- TRX signals map the time evolution of electronic charge distribution and current flux density.
- Current flux density qualitatively reveals electronic momentum distribution and charge migration mechanisms.
- Quantitative information on electronic coherence timescales is obtained.
Conclusions:
- TRX is a versatile technique for characterizing electronic dynamics beyond charge distribution.
- The study provides a new method to probe electron flow and ultrafast charge migration.
