Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-01899-1
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Funding
- Air Force Office of Scientific Research under MURI [FA9550-16-1-0013, FA9550-15-1-0037]
- Presidential Fellowship of The Ohio State University
- AFOSR YIP [FA9550-15-1-0203]
- National Science Foundation [DMR-1507274]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1507274] Funding Source: National Science Foundation
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High-harmonic generation from gases produces attosecond bursts and enables high-harmonic spectroscopy to explore electron dynamics in atoms and molecules. Recently, high-harmonic generation from solids has been reported, resulting in novel phenomena and unique control of the emission, absent in gas-phase media. Here we investigate high harmonics from semiconductors with controllable induced photo-carrier densities, as well as the driving wavelengths. We demonstrate that the dominant generation mechanism can be identified by monitoring the variation of the harmonic spectra with the carrier density. Moreover, the harmonic spectral dependence on the driving wavelength is reported and a different dependence from the well-known one in gas-phase media is observed. Our study provides distinct control of the harmonic process from semiconductors, sheds light on the underlying mechanism and helps optimize the harmonic properties for future solid-state attosecond light sources.
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