Theoretical Analysis of High-Harmonic Generation in Solids

被引:622
作者
Vampa, G. [1 ]
McDonald, C. R. [1 ]
Orlando, G. [1 ]
Klug, D. D. [2 ]
Corkum, P. B. [1 ,2 ]
Brabec, T. [1 ]
机构
[1] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada
[2] Natl Res Council Canada, Ottawa, ON K1A 0R6, Canada
关键词
HOMOGENEOUS ELECTRIC-FIELD; LASER-INDUCED BREAKDOWN; FEMTOSECOND LASER; BLOCH ELECTRONS; IONIZATION; DIELECTRICS; PARAMETERS; DYNAMICS; PULSES; GAAS;
D O I
10.1103/PhysRevLett.113.073901
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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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页数:5
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