Sub-band picture of high-harmonic generation in solids
arXiv:1906.00596 · doi:10.1103/PhysRevB.100.081203
Abstract
We propose a novel picture of high-harmonic generation (HHG) in solids based on the concept of temporally changing band structures. To demonstrate the utility of this picture, we focus on the high-order sideband generation (HSG) caused by strong terahertz (THz) and weak near-infrared (NIR) light in the context of pump-probe spectroscopy. We find that the NIR frequency dependence of the HSG indicates the existence of new energy levels (sub-bands) around the band-gap energy, which have multiple frequencies of THz light. This sub-band picture explains why the HSG intensity becomes a non-monotonic function of the THz light amplitude. The present analysis not only reveals the origin of the plateau structure in HHG spectra, but also provides a connection to other high-field phenomena.
arXiv comment9 pages, 4 figures
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- Piezo-optic effect of high-harmonic generation in semiconductors
- Tuning the electronic band structure of metal surfaces for enhancing high-order harmonic generation