# Oscillations in electron transport caused by multiple resonances in a quantum dot-QED system in the steady-state regime

## TL;DR

This paper models electron transport in a quantum dot-cavity system, revealing oscillations and resonant peaks caused by multiple photon resonances and Rabi-splitting effects, with the dynamics influenced by photon polarization.

## Contribution

It introduces a detailed quantum master equation approach to analyze electron transport through a multi-level quantum dot coupled to a photon cavity, highlighting the role of multiple resonances and photon polarization.

## Key findings

- Oscillations in charge due to photon resonances
- Multiple transport current peaks at resonance energies
- Dependence of Rabi-splitting on photon polarization

## Abstract

We model the electron transport current as the photon energy is swept through several resonances of a multi-level quantum dot, embedded in a short quantum wire, coupled to photon cavity. We use a Markovian quantum master equation appropriate for the long-time evolution and include the electron-electron and both the para- and the diamagnetic electron-photon interactions via diagonalization in a truncated many-body Fock space. Tuning the photon energy, several anti-crossings caused by Rabi-splitting in the energy spectrum of the quantum dot system are found. The strength of the Rabi-splittings and the photon-exchange between the resonant states depend on the polarization of the cavity photon field. We observe oscillations of the charge in the system and several resonant transport current peaks for the photon energies corresponding to the resonances in the steady-state regime.