The role of relative potential energy of occupied sites in high-order harmonic generation from solid states is investigated. It is found that the conversion efficiency of high-order harmonic spectrum can be enhanced by tuning the relative potential energy of neighboring occupied sites in one-dimensional model. This phenomenon can be attributed to the changing of energy bands. A two-dimensional Kronig–Penney potential is applied to model the salt–rock structure. Similar phenomenon as in the one-dimensional case is also found. Our results provide a potential method to enhance the efficiency of high-order harmonic generation from solids.
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