Journal
PHYSICAL REVIEW B
Volume 91, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.035119
Keywords
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Funding
- Deutsche Forschungsgemeinschaft [Sonderforschungsbereich 925, EB-154/23-1, EB-154/26-1]
- CENTEM project [CZ.1.05/2.1.00/03.0088]
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A theoretical framework for pump-probe photoemission is presented. The approach is based on a general formulation using the Keldysh formalism for the lesser Green's function to describe the real-time evolution of the electronic degrees of freedom in the initial state after a strong pump pulse that drives the system out of equilibrium. The final state is represented by a time-reversed low-energy electron-diffraction state. Our one-step description is related as close as possible to Pendry's original formulation of the photoemission process. The formalism allows for a quantitative calculation of time-dependent photocurrent for simple metals where a picture of effectively independent electrons is assumed to be reliable. The theory is worked out for valence-and core-electron excitations. It comprises the study of different relativistic effects as a function of the pump-probe delay.
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