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We reveal the physics of intraband dynamics in laser-driven solids, highlighting transitions between lattice wells. This advances understanding of harmonic generation and its energy cutoffs.

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Area of Science:

  • Solid-state physics
  • Quantum optics
  • Nonlinear optics

Background:

  • Laser-matter interactions drive harmonic generation in solids.
  • Harmonic spectra arise from interband and intraband electronic transitions.
  • Intraband dynamics are crucial but less understood than interband processes.

Purpose of the Study:

  • To develop a theory for intraband dynamics in laser-driven solids.
  • To elucidate the role of inter-well transitions in harmonic generation.
  • To provide quantitative predictions for harmonic spectra.

Main Methods:

  • Development of a theory based on Wannier states.
  • Analysis of electron dynamics within individual energy bands.
  • Modeling of transitions between different lattice wells.

Main Results:

  • The theory reveals the underlying physics of intraband dynamics.
  • Transitions between lattice wells are shown to be determinant.
  • Quantitative predictions for harmonic energy cutoffs, yields, and emission times are provided.

Conclusions:

  • The Wannier state approach offers deep insights into intraband harmonic generation.
  • Understanding intraband dynamics is key to controlling harmonic emission.
  • This work provides a framework for predicting and optimizing harmonic generation in solids.