One-step theory of pump-probe photoemission

Abstract

A theoretical frame 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 to Pendry's original formulation of the photoemission process as close as possible. The formalism allows for a quantitative calculation of time-dependent photocurrent for simple metals where a picture of effectively independent electrons is assumed as 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.

References in corpus (4)

• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Theoretical description of time-resolved photoemission spectroscopy: application to pump-probe experiments
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• Non-equilibrium cluster-perturbation theory

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• Comment on "Distinction of Electron Dispersion in Time-Resolved Photoemission Spectroscopy"
• Quantum beats of coherent 1s 2s excitons in two dimensional transition metal