Effects of cavity and superradiance on the electrical transport through quantum dots

TL;DR

This paper introduces a method to measure the Purcell effect via current changes in quantum dots within microcavities, revealing superradiance interference, photon trapping, and potential control of single-photon emission.

Contribution

It presents a novel approach to observe cavity and superradiance effects on quantum dot transport, linking optical phenomena with electrical measurements.

Findings

Current varies with cavity length, indicating the Purcell effect.

Inter-dot interference leads to superradiance features in current.

Photon trapping causes current suppression and entanglement.

Abstract

A novel method is proposed to measure the Purcell effect by observing the current through a semiconductor quantum dot embedded inside a microcavity. The stationary current is shown to be altered if one varies the cavity length. For the double-dot system, the stationary current is found to show the interference feature (superradiance) as the inter-dot distance is varied. The amplitude of oscillation can be increased by incorporating the system into a microcavity. Furthermore, the current is suppressed if the dot distance is small compared to the wavelength of the emitted photon. This photon trapping phenomenon generates the entangled state and may be used to control the emission of single photons at predetermined times.