# Magnetically controlled exciton transfer in hybrid quantum dot-quantum well nanostructures

## TL;DR

This study investigates how strong magnetic fields influence exciton transfer between quantum dots and quantum wells in hybrid nanostructures, revealing magnetic control over carrier dynamics and photoluminescence behavior.

## Contribution

It demonstrates magnetic field-dependent exciton transfer mechanisms in hybrid quantum dot-quantum well structures, highlighting the role of barrier thickness and magnetic field strength.

## Key findings

- QW PL intensity increases with magnetic field at thin barriers.
- QD PL intensity decreases as QW PL increases under strong magnetic fields.
- Carrier dynamics between QD and QW are modulated by magnetic field and barrier thickness.

## Abstract

A magnetophotoluminescence study of the carrier transfer with hybrid InAs/GaAs quantum dot(QD)-InGaAs quantum well (QW) structures is carried out where we observe an unsual dependence of the photoluminescence (PL) on the GaAs barrier thickness at strong magnetic field and excitation density. For the case of a thin barrier the QW PL intensity is observed to increase at the expense of a decrease in the QD PL intensity. This is attributed to changes in the interplane carrier dynamics in the QW and the wetting layer (WL) resulting from increasing the magnetic field along with changes in the coupling between QD excited states and exciton states in the QW and the WL.