Abstract
Using a quasiclassical approach, we demonstrate that the formation of the low-energy structure in above-threshold ionization spectra by intense, midinfrared laser pulses originates from a two-dimensional focusing of the strong-field dynamics in the energy-angular-momentum plane. We show that the low-energy structure is very sensitive to the carrier-envelope phase of the laser field.
Highlights
Strong-field ionization is one of the fundamental processes in the interaction of intense laser fields with matter [1]
We show with the help of classical trajectory Monte Carlo (CTMC) calculations that the low-energy structure (LES) is related to a classical two-dimensional focusing in phase space giving rise to a strong correlation between the energy E and the angular momentum L of the LES electrons
The LES occurs for large ratios of quiver amplitude to distances of the tunnel exit
Summary
Strong-field ionization is one of the fundamental processes in the interaction of intense laser fields with matter [1]. The SFA is expected to work well for Keldysh parameters γ = ω 2IP E0
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