Graphene as a tunable THz reservoir for shaping the Mollow triplet of an artificial atom via plasmonic effects

TL;DR

This paper demonstrates how the resonance fluorescence of a quantum dot can be actively tuned in the THz regime by adjusting the local density of states using graphene layers, accounting for losses, dispersion, and thermal effects.

Contribution

It introduces a method to control the Mollow triplet spectrum of an artificial atom via graphene biasing, incorporating realistic photon Green function theory and environmental effects.

Findings

Resonance fluorescence spectra can be tuned by graphene bias.

Graphene layers influence the Mollow triplet structure.

Thermal effects are significant at low THz frequencies.

Abstract

Using a realistic quantum master equation we show that the resonance fluorescence spectra of a two-level artificial atom (quantum dot) can be tuned by adjusting its photonic local density of states via biasing of one or more graphene monolayers. The structured photon reservoir is included using a photon Green function theory which fully accounts for the loss and dispersion. The field-driven Mollow triplet spectrum can be actively controlled by the graphene bias in the THz frequency regime. We also consider the effect of a dielectric support environment, and multiple graphene layers, on the emitted fluorescence. Finally, thermal bath effects are considered and shown to be important for low THz frequencies.