Experimental evidence of above-threshold photoemission in solids
Francesco Banfi, Claudio Giannetti, Gabriele Ferrini, Gianluca, Galimberti, Stefania Pagliara, Daniele Fausti, and Fulvio Parmigiani
TL;DR
This paper reports the first experimental observation of above-threshold photoemission in a solid, specifically from a silver crystal, using femtosecond laser pulses, providing a benchmark for theoretical models.
Contribution
It provides the first experimental evidence of above-threshold photoemission in solids and quantifies the ratio between different photon emission processes.
Findings
Above-threshold photoemission observed in a solid for the first time.
The ratio between three-photon and two-photon emission edges is 10^{-4}.
Results serve as a benchmark for theoretical understanding.
Abstract
Nonlinear photoemission from a silver single crystal is investigated by femtosecond laser pulses in a perturbative regime. A clear observation of above-threshold photoemission in solids is reported for the first time. The ratio between the three-photon above-threshold and the two-photon Fermi edges is found to be 10^{-4}. This value constitutes the only available benchmark for theories aimed at understanding the mechanism responsible for above-threshold photoemission in solids.
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