Light-emitting current of electrically driven single-photon sources

TL;DR

This paper presents a theoretical study of the tunnelling current in electrically driven single-photon sources, revealing oscillations superimposed on classical charging behavior using advanced quantum models.

Contribution

It introduces a nonequilibrium Green's function approach combined with the Anderson model to analyze tunnelling currents in single-photon sources, ensuring charge conservation and gauge invariance.

Findings

Oscillations observed in tunnelling current under rectangular pulse voltage

Charge conservation and gauge invariance satisfied in the model

Classical capacitive charging behavior identified

Abstract

The time-dependent tunnelling current arising from the electron-hole recombination of exciton state is theoretically studied using the nonequilibrium Green's function technique and the Anderson model with two energy levels. The charge conservation and gauge invariance are satisfied in the tunnelling current. Apart from the classical capacitive charging and discharging behavior, interesting oscillations superimpose on the tunnelling current for the applied rectangular pulse voltage.