Fig. 1: High harmonic spectra in silicon. | Communications Physics

Fig. 1: High harmonic spectra in silicon.

From: Role of Van Hove singularities and effective mass anisotropy in polarization-resolved high harmonic spectroscopy of silicon

Fig. 1

a, b Experimental high harmonic spectra (HHG signal) reflected from monocrystalline silicon with linear polarization of the driving pulse along [100] (black curves) and [110] (red curves) crystallographic directions. The central photon energies of the driving pulses are a 0.6 eV (wavelength of 2000 nm) and b 1.65 eV (wavelength of 750 nm). The peak intensity is I0 = 3 TW/cm2 in both a and b. c, d High harmonic spectra for both polarization directions of the driving pulses and the same photon energies as used in a and b calculated using time-dependent density functional theory with Tran-Blaha (TB09) functional.

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