Attosecond spectroscopy of solids: streaking phase shift due to lattice scattering

TL;DR

This paper develops a theoretical model for laser-assisted photoemission from solids, revealing that lattice scattering near band gaps causes significant streaking phase shifts of about 100 attoseconds, impacting attosecond spectroscopy experiments.

Contribution

It introduces a numerically exact model including full band structure effects to explain streaking phase shifts due to lattice scattering in solids.

Findings

Lattice scattering causes a ~100 as phase shift in streaking spectrograms.

The phase shift persists even with very small photoelectron mean free paths.

The effect is explained through Bloch electron dynamics.

Abstract

Theory of laser-assisted photoemission from solids is developed for a numerically exactly solvable model with full inclusion of band structure effects. The strong lattice scattering in the vicinity of band gaps leads to a distortion and a temporal shift of the streaking spectrogram of the order of 100 as. The effect is explained in terms of Bloch electron dynamics and is shown to remain large for an arbitrarily small photoelectron mean free path. The implications for the streaking experiment on W(110) [A. L. Cavalieri et al., Nature (London) {\bf 449}, 1029 (2007)]