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One-step theory of pump-probe photoemission

BRAUN, J., RAUSCH, R., POTTHOFF, M., MINÁR, J., EBERT, H. One-step theory of pump-probe photoemission. Physical Review B, 2015, roč. 91, č. 3, s. \´035119-1\´- \´035119-9\´. ISSN: 1098-0121
Jazyk publikace: eng
Anglický název: One-step theory of pump-probe photoemission
Rok vydání: 2015
Autoři: J. Braun , R. Rausch , M. Potthoff , Doc.Dr. Jan Minár , H. Ebert
Abstrakt EN: 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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