Quantum Dot in a Hybrid Structure with Dipolar Excitons

TL;DR

This paper investigates how the presence of dipolar excitons in a 2D system affects the energy levels of a nearby quantum dot, revealing shifts dependent on exciton density and phase state, including BEC.

Contribution

It provides a theoretical analysis of electron energy level shifts in a quantum dot caused by interactions with dipolar excitons in different phases.

Findings

Energy level shifts depend on exciton density and phase.

Shifts are analyzed for normal and BEC states.

Results show phase-dependent perturbations of QD levels.

Abstract

Electron states in a quantum dot (QD) located near a 2D system of dipolar excitons are perturbed by fluctuations of the exciton density caused by the electron-exciton interaction. This results in the frequency changes of electron transitions in a QD. The frequency depends on the exciton density, as well as on the exciton gas phase state. In the present work, the shifts of the two lowest QD energy levels are found both in the normal state of the exciton system and for the Bose-Einstein condensation (BEC) regime.