Two-color harmonic spectroscopy of HOPG reveals a laser-intensity-dependent advance of fourth-harmonic emission caused by near-Dirac-point carrier saturation (state blocking).
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Two-color harmonic spectroscopy of ultrafast Dirac electron dynamics
Two-color harmonic spectroscopy of HOPG reveals a laser-intensity-dependent advance of fourth-harmonic emission caused by near-Dirac-point carrier saturation (state blocking).