Edge-state-induced correlation effects in two-color high-harmonic generation

TL;DR

This paper demonstrates that two-color high-harmonic spectroscopy can detect edge-state-induced electron correlation effects in nanostructured materials, revealing enhanced harmonic generation efficiency due to ultrafast many-electron dynamics.

Contribution

It introduces a method to identify edge-state effects in high-harmonic generation, highlighting the role of electron correlations in nanostructured band-gap materials.

Findings

Correlation effects increase harmonic signal efficiency

Edge states influence ultrafast electron dynamics

Enhanced high-harmonic generation compared to bulk materials

Abstract

We show that two-color high-harmonic spectroscopy can reveal finite-size and edge-state-induced dynamic electron correlation effects in a generic nanostructured band-gap material. Compared to the response of a bulk sample, we demonstrate a significant correlation-induced increase in the efficiency of the generated signal over a wide range of frequencies by harnessing the power of these ultrafast many-electron dynamics.