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We investigate the high harmonic generation (HHG) in solids driven by laserfields with different ellipticities. The HHG spectra show a two-plateaustructure within the energy gap between the valence band and the firstconduction band. These two plateaus depend distinctly on the laser ellipticity.The first plateau is decreased while the second plateau is enhanced withincreasing the laser ellipticity. To understand these phenomena, we develop anintuitive Reciprocal-Space- Trajectory (RST) method, with which HHG in solidsis explained by a trajectory-ensemble from different initial states anddifferent ionization times in the reciprocal space. In the framework of RST, wecan not only quantitatively reproduce the HHG spectra, but also well understandthe underlying physics of these phenomena, providing a deep insight into themechanism of HHG in solids.

High harmonic generation with circularly polarized fields in solid: a quantum trajectory perspective