H. Huang, Liwei Song, Nicolas Tancoene-Deiean, N. Klemke, Á. Rubio, F. Kärtner, Oliver D. Miicke
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Ultrafast Control of Even-Order Harmonic Generation from Solids by an Intense Terahertz Field
Nonperturbative even-order harmonics, physically forbidden in centrosymmetric crystals, are observed from both insulator (diamond) and semiconductor (silicon) samples driven by IR pulses, when in addition an intense THz electric field is applied to the solid. The time-resolved study of the high-harmonic spectra with the temporal profile of the THz electric field suggests a transient THz-field-induced symmetry reduction. We also investigate the harmonics' yields depending on the angles of the linear IR and THz polarizations with respect to the crystal axes. This work might pave the way for THz-based symmetry control in solids with important ramifications for petahertz electronics.
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