Strong exciton binding in quantum structures through remote dielectric confinement

TL;DR

This paper introduces a hybrid quantum structure with remote dielectric confinement that significantly enhances exciton binding energies, enabling room-temperature exciton stability in conventional semiconductor nanostructures.

Contribution

It presents a novel hybrid system combining quantum and dielectric confinement, demonstrating enhanced exciton binding energies through dielectric mismatch effects.

Findings

Exciton binding energy can be more than doubled.

Remote dielectric confinement enables room-temperature excitons in quantum wires.

Polarization charges at interfaces are key to the enhancement.

Abstract

We propose a new type of hybrid systems formed by conventional semiconductor nanostructures with the addition of remote insulating layers, where the electron-hole interaction is enhanced by combining quantum and dielectric confinement over different length scales. Due to the polarization charges induced by the dielectric mismatch at the semiconductor/insulator interfaces, we show that the exciton binding energy can be more than doubled. For conventional III-V quantum wires such remote dielectric confinement allows exciton binding at room temperature.