On the optical Stark effect of excitons in InGaAs prolate ellipsoidal quantum dots

TL;DR

This study investigates the optical Stark effect in InGaAs prolate ellipsoidal quantum dots, revealing exciton absorption peak splitting due to a three-level Stark effect influenced by quantum dot shape and pump laser parameters.

Contribution

It provides the first analysis of the three-level optical Stark effect in prolate ellipsoidal quantum dots using renormalized wavefunction theory, highlighting shape-dependent phenomena.

Findings

Exciton absorption peaks split into two under strong resonant pump laser.

Quantum dot shape significantly influences the Stark effect characteristics.

Comparison shows shape effects are crucial in excitonic optical properties.

Abstract

In this paper, we study the exciton absorption spectra in InGaAs prolate ellipsoidal quantum dots when a strong pump laser resonant with electron quantized levels is active. Our obtained results by renormalized wavefunction theory show that, under suitable conditions, the initial exciton absorption peak is split into two new peaks as the evidence of the existence of the three-level optical Stark effect of excitons. We have suggested an explanation of the origin of the effect as well as investigating the effect of pump field energy, size, and geometric shape of the quantum dots on effect characteristics. The comparison with the results obtained in the spherical quantum dots implies the important role of geometric shape of the quantum structures when we examine this effect.