# The photocurrent generated by photon replica states of an off-resonantly coupled dot-cavity system

## TL;DR

This study investigates how photon replica states in an off-resonant quantum dot-cavity system generate photocurrent, revealing the effects of photon polarization and coupling strength on transport properties.

## Contribution

It introduces a detailed analysis of photocurrent generation via photon replica states in off-resonant quantum dot-cavity systems, highlighting the influence of photon polarization and coupling parameters.

## Key findings

- Photocurrent is generated by photon replica states in off-resonant conditions.
- Photon polarization significantly affects the photocurrent.
- Photocurrent is relatively insensitive to the average photon number in the environment.

## Abstract

Transport properties of a quantum dot coupled to a photon cavity are investigated using a quantum master equation in the steady-state regime. In the off-resonance regime, when the photon energy is smaller than the energy spacing between the lowest electron states of the quantum dot, we calculate the current that is generated by photon replica states as the electronic system is pumped with photons.Tuning the electron-photon coupling strength, the photocurrent can be enhanced by the influences of the photon polarization, and the cavity-photon coupling strength of the environment. We show that the current generated through the photon replicas is very sensitive on the photon polarization, but it is not strongly dependent on the average number of photons in the environment.