Detuning dependence of high-order harmonic generation in monolayer transition metal dichalcogenides

TL;DR

This paper explores how frequency detuning influences high-order harmonic generation in monolayer TMDCs, revealing controllable anomalous emissions that could enable new optical device applications.

Contribution

It introduces the concept that detuning can control both parallel and perpendicular HHG emissions in TMDCs, a novel finding in the field.

Findings

Detuning can enhance multiphoton resonances in HHG.

TMDCs exhibit both parallel and perpendicular emissions.

Anomalous emission can be controlled via frequency detuning.

Abstract

We theoretically investigate detuning-dependent properties of high-order harmonic generation (HHG) in monolayer transition metal dichalcogenides (TMDCs). In contrast to HHG in conventional materials, TMDCs show both parallel and perpendicular emissions with respect to the incident electric field. We find that such an anomalous emission can be artificially controlled by the frequency detuning of the incident electric fields, i.e., the parallel and perpendicular HHG can be strongly enhanced by multiphoton resonances. This peculiar phenomenon would provide a way for controlling HHG in TMDCs and stimulate the realization of novel optical devices.