Photon and magnetic field controlled electron transport of a multiply-resonant photon-cavity double quantum dot system

TL;DR

This paper investigates how electron transport in a double quantum dot system coupled to a photon cavity can be controlled using magnetic fields and photon parameters, revealing complex resonance phenomena and current modulation effects.

Contribution

It demonstrates the control of electron transport via magnetic field and photon cavity tuning, highlighting the role of multi-level Rabi resonances in a DQD-cavity system.

Findings

Multiple Rabi resonances cause current dips at specific photon energies.

Magnetic field strength displaces and diminishes the current dip.

Photon exchange between states decreases with magnetic field and geometric changes.

Abstract

We study electron transport through double quantum dots (DQD) coupled to a cavity with a single photon mode. The DQD is connected to two electron reservoirs, and the total system is under an external perpendicular magnetic field. The DQD system exhibits a complex multi-level energy spectrum. By varying the photon energy, several anti-crossings between photon dressed electron states of the DQD-cavity system are found at low strength of the magnetic field. The anti-crossings are identified as multiple Rabi resonances arising from the photon exchange between these states. As the results, a dip in the current is seen caused by the multiple Rabi resonances. By increasing the strength of the external magnetic field, a dislocation of the current dip to a lower photon energy is found and the current dip can be diminished. The interplay of the strength of the magnetic field and the geometry of the states the DQD system can weaken the multiple Rabi resonances in which the exchange of photon between the anti-crossings is decreased. We can therefore confirm that the electron transport behavior in the DQD-cavity system can be controlled by manipulating the external magnetic field and the photon cavity parameters.