High-harmonic generation from monolayer and bilayer graphene

High-harmonic generation (HHG) in solids is an emerging method to probe ultrafast electron dynamics in solids at attosecond time scale. In this work, we study HHG from monolayer and bilayer graphene. Bilayer graphenes with AA and AB stacking are considered in this work. It is found that the monolayer and bilayer graphenes exhibit significantly different harmonic spectra. The difference in the spectra is attributed to the interlayer coupling between the two layers. Also, the intraband and interband contributions to the total harmonic spectrum play a significant role. Moreover, interesting polarization and ellipticity dependence are noticed in total harmonic spectrum for monolayer and bilayer graphene.

Automated summary

The study shows significant differences in high-harmonic generation between monolayer and bilayer graphene, with the interlayer coupling and contributions from intraband and interband transitions playing important roles. Additionally, interesting polarization and ellipticity dependencies are observed in the total harmonic spectrum of monolayer and bilayer graphene.