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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Solid-state harmonics beyond the atomic limit.

Georges Ndabashimiye1,2, Shambhu Ghimire2, Mengxi Wu3

  • 1Department of Applied Physics, Stanford University, Stanford, California 94305, USA.

Nature
|June 10, 2016
PubMed
Summary
This summary is machine-generated.

High harmonic generation in solids differs from gases, showing multiple plateaus and suggesting similar electron-hole recollision mechanisms. This opens possibilities for solid-state attosecond pulse generation and orbital tomography.

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Area of Science:

  • Solid-state physics
  • Quantum optics
  • Nonlinear optics

Background:

  • Strong-field laser excitation induces nonlinear electronic and optical behavior in solids.
  • High harmonic generation (HHG) in solids extends to vacuum-ultraviolet and extreme-ultraviolet regions.
  • Fundamental differences in HHG mechanisms between solids and atomic gases are debated.

Purpose of the Study:

  • Directly compare HHG in solid and gas phases of argon and krypton.
  • Investigate the role of high density and periodicity in solid-state HHG.
  • Clarify microscopic mechanisms underlying solid-state HHG.

Main Methods:

  • Experimental comparison of HHG in solid and gas phases of noble gases (argon, krypton).
  • Measurement of high harmonic generation spectra.
  • Analysis of harmonic yield dependence on laser ellipticity.

Main Results:

  • Solid-state HHG spectra exhibit multiple plateaus extending beyond the atomic limit.
  • Multiple plateaus indicate strong interband couplings involving multiple single-particle bands.
  • Solid and gas HHG yields show similar dependence on laser ellipticity, suggesting electron-hole recollision.

Conclusions:

  • Noble gas solids provide a unique medium to study density and periodicity effects in HHG.
  • Electron-hole recollision is significant in solid-state HHG.
  • Gas-phase techniques like polarization gating and orbital tomography may be applicable to solids.