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Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Materials science

Background:

  • High harmonic generation (HHG) is crucial for studying material properties and ultrafast dynamics.
  • Understanding many-body interactions in HHG is limited by neglecting couplings with quasiparticles like phonons.

Purpose of the Study:

  • To reveal the many-body electron-phonon mechanism in quasiparticle-coupled strong-field dynamics.
  • To investigate nonadiabatic (NA) coherent-phonon-coupled HHG.
  • To establish experimental methods for probing electron-phonon interactions.

Main Methods:

  • Investigating nonadiabatic (NA) coherent-phonon-coupled high harmonic generation (HHG).
  • Analyzing the influence of coherent phonons on HHG through adiabatic band modulation and nonadiabatic photocarrier distribution.
  • Examining phonon period and phase delay in HHG intensity oscillations.

Main Results:

  • Coherent phonons significantly impact HHG via adiabatic band modulation and nonadiabatic photocarrier dynamics.
  • Both adiabatic and nonadiabatic mechanisms leave measurable fingerprints in HHG intensity oscillations.
  • Phonon period and phase delay provide direct experimental signatures of electron-phonon interactions.

Conclusions:

  • The study elucidates the crucial role of electron-phonon coupling in strong-field dynamics and HHG.
  • Experimental measurement of phonon-induced effects on HHG oscillations allows direct probing of electron-phonon interactions.
  • This work opens new avenues for exploring material properties and ultrafast dynamics through HHG.