Fig. 2: Laser-induced total currents and time-frequency analysis of harmonic emissions.
From: Enhanced high harmonic efficiency through phonon-assisted photodoping effect
a Time-frequency analysis of harmonic emissions for hBN with the TO (E1u) mode. At different times (x-axis), the intensity illustrates the emitted harmonics with corresponding energy (y-axis). b The same quantity as (a) for graphite with TO (E1u) mode. c The same quantity as (a) for MoS2 with the \({E}_{2g}^{1}\) mode. The vector potentials of the applied laser pulses are shown in (a–c) (white curves), respectively.
