Plasmon-assisted photoelectron emission in a model cluster using time-dependent density functional theory and the time-dependent surface-flux method

TL;DR

This paper uses TDDFT and t-SURFF to study plasmon-assisted photoelectron emission in a model cluster, revealing long-lived plasmon oscillations and post-pulse electron emission with detailed spectral analysis.

Contribution

It introduces a combined TDDFT and t-SURFF approach to analyze plasmon-assisted photoemission, highlighting effects beyond standard ATI in a model system.

Findings

Observation of peaks from long-lived plasmon oscillations

Detection of electron emission after the laser pulse

Scaling behavior of spectral peaks with laser intensity

Abstract

We investigate plasmon-assisted photoelectron emission using a one-dimensional time-dependent density-functional theory (TDDFT) model. Photoelectron spectra are computed with the time-dependent surface-flux (t-SURFF) method. In addition to the expected above-threshold ionization (ATI) comb, we observe peaks that arise from long-lived plasmon oscillations and the associated electron emission occurring after the laser pulse. We further analyze the positions of these peaks and their scaling behavior with the laser intensity.