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. 2014 Aug 15;113(7):073901.
doi: 10.1103/PhysRevLett.113.073901. Epub 2014 Aug 13.

Theoretical analysis of high-harmonic generation in solids

G Vampa  1 , C R McDonald  1 , G Orlando  1 , D D Klug  2 , P B Corkum  1 , T Brabec  1
Affiliations

Theoretical analysis of high-harmonic generation in solids

G Vampa et al. Phys Rev Lett. .

Abstract

We investigate theoretically high-harmonic generation (HHG) in bulk crystals exposed to intense midinfrared lasers with photon energies smaller than the band gap. The two main mechanisms, interband and intraband HHG, are explored. Our analysis indicates that the interband current neglected so far is the dominant mechanism for HHG. Saddle point analysis in the Keldysh limit yields an intuitive picture of interband HHG in solids similar to atomic HHG. Interband and intraband HHG exhibit a fundamentally different wavelength dependence. This signature can be used to experimentally distinguish between the two mechanisms in order to verify their importance.

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