Solid-state HHG is anticipated to pave way for integrated XUV and attosecond light sources but typically relies on enormous light-matter interaction strengths which are difficult to attain in nano-optical systems with inherently small volumes. Here, we theoretically explore the synergies between electronic band structure and plasmonic resonances in the HHG yield of graphene and phosphorene and reveal the effects of size, edge termination, and doping in plasmon-assisted HHG. We apply a second-principles description based on Maximally Localized Wannier Functions which incorporate crucial finite-size and electronic bandstructure features in the nonlinear optical response of 2D materials patterned on mesoscopic length scales.
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