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Real-space picture of electron recollision with the parent ion guides ourunderstanding of the highly nonlinear response of atoms and molecules tointense low-frequency laser fields. It is also among several leadingcontestants for the dominant mechanism of high harmonic generation (HHG) insolids, where it is typically viewed in the momentum space, as therecombination of the conduction band electron with the valence band hole,competing with another HHG mechanism, the strong-field driven Blochoscillations. In this work, we use numerical simulations to directly test andconfirm the real-space recollision picture as the key mechanism of HHG insolids. Our tests take advantage of the well-known characteristic features inthe molecular harmonic spectra, associated with the real-space structure of themolecular ion. We show the emergence of analogous spectral features whensimilar real-space structures are present in the periodic potential of thesolid-state lattice. This work demonstrates the capability of HHG imaging ofspatial structures of a unit cell in solids.

Direct Numerical Observation of Real-Space Recollision in High-Harmonic Generation from Solids