Determination of Electron Band Structure using Temporal Interferometry

TL;DR

This paper introduces a novel all-optical method using temporal interferometry with high harmonic generation to directly reconstruct semiconductor band structures from a single spectrum measurement, enabling ultrafast and ambient condition studies.

Contribution

The paper presents a new single-shot, all-optical approach to directly determine semiconductor band structures using temporal Young's interferometry with HHG, which is a significant advancement over traditional methods.

Findings

Successfully reconstructs band structures from HHG spectra

Enables ultrafast tracking of band structure modifications

Operates under ambient conditions

Abstract

We propose an all-optical method to directly reconstruct the band structure of semiconductors. Our scheme is based on the temporal Young's interferometer realized by high harmonic generation (HHG) with a few-cycle laser pulse. As a time-energy domain interferometric device, temporal interferometer encodes the band structure into the fringe in the energy domain. The relation between the band structure and the emitted harmonic frequencies is established. This enables us to retrieve the band structure from the HHG spectrum with a single-shot measurement. Our scheme paves the way to study matters under ambient conditions and to track the ultrafast modification of band structures.