High-order harmonic generation in hexagonal nanoribbons

Abstract The generation of high-order harmonics in finite, hexagonal nanoribbons is simulated. Ribbons with armchair and zig-zag edges are investigated by using a tight-binding approach only nearest-neighbor hopping. By turning an alternating on-site potential off or on, the system describes for example graphene boron nitride, respectively. incoming laser pulse linearly polarized along ribbons. emitted light has polarization component parallel to field. presence absence perpendicular field can be explained symmetry Characteristic features harmonic spectra finite ribbons analyzed help band structure corresponding periodic systems.