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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Characterizing Anomalous High-Harmonic Generation in Solids.

Lun Yue¹, Mette B Gaarde¹

¹Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA.

Physical Review Letters

|May 8, 2023

Summary

This summary is machine-generated.

Researchers identified unique signatures of anomalous high-harmonic generation (HHG) in solids. These findings help isolate pure anomalous harmonics, enabling control and Berry curvature reconstruction.

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Area of Science:

Solid-state physics
Quantum optics
Strong-field physics

Background:

Anomalous high-harmonic generation (HHG) in solids is driven by Berry-curvature-induced anomalous currents.
Observing pure anomalous harmonics is challenging due to contamination from interband coherences.

Purpose of the Study:

To fully characterize the anomalous HHG mechanism in solids.
To develop a method for decomposing the total current in strong-field laser-solid interactions.
To identify unique signatures for disentangling anomalous harmonics.

Main Methods:

Developed an ab initio methodology for strong-field laser-solid interaction.
Rigorous decomposition of the total current into contributing mechanisms.
Analysis of anomalous harmonic yields as a function of laser parameters.

Main Results:

Identified two key properties of anomalous harmonic yields: increased yield with laser wavelength and pronounced minima at specific wavelengths/intensities.
These minima are associated with drastic changes in spectral phases.
Demonstrated signatures that allow separation of anomalous harmonics from competing mechanisms.

Conclusions:

The identified signatures enable experimental isolation and time-domain control of pure anomalous harmonics.
This work paves the way for reconstructing Berry curvatures using HHG.
Provides a robust theoretical framework for studying strong-field phenomena in solids.