Fig. 4: Photon-induced doping effects in enhanced harmonic efficiency.
From: Enhanced high harmonic efficiency through phonon-assisted photodoping effect
a Number of excited electrons as a function of time in hBN with the excited TO (E1u) mode under different laser intensities. b Number of excited electrons for the phonon-free case pulses and the excited phonon case in bulk hBN for different laser intensities at the end of the laser The excited electrons indicate the number of photoexcited electrons after the laser pulse (t = 50 fs) as shown in (a). c The dependence of harmonic enhancement (\(\frac{{Y}_{{Phonon}}}{{Y}_{{Frozen}-{ions}}}\)) on photoinduced carrier enhancement (\(\frac{{N}_{{Phonon}}}{{N}_{{Frozen}-{ions}}}\)). The harmonic yields are integrated over the harmonic plateaus for the corresponding materials. Different points are from various laser powers, and the initial phonon displacements are kept the same. Blue and red dots indicate the dependence of harmonic yield enhancement on the carrier enhancement for graphite and MoS2, respectively. The gray line is a guide for the eyes.
