High-order harmonic generation in hexagonal nanoribbons

TL;DR

This paper simulates high-order harmonic generation in finite hexagonal nanoribbons, analyzing how edge types and symmetry influence the emitted light's polarization and spectral features.

Contribution

It introduces a tight-binding simulation approach for finite nanoribbons, linking harmonic spectra to ribbon symmetry and band structure.

Findings

Harmonic spectra depend on ribbon edge type and symmetry.

Polarization of emitted light aligns with the incident laser.

Spectral features relate to the band structure of the system.

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 with only nearest neighbor hopping. By turning an alternating on-site potential off or on, the system describes for example graphene or hexagonal boron nitride, respectively. The incoming laser pulse is linearly polarized along the ribbons. The emitted light has a polarization component parallel to the polarization of the incoming field. The presence or absence of a polarization component perpendicular to the polarization of the incoming field can be explained by the symmetry of the ribbons. Characteristic features in the harmonic spectra for the finite ribbons are analyzed with the help of the band structure for the corresponding periodic systems.