Infinite order excitonic Bloch equations for asymmetric nanostructures

TL;DR

This paper introduces a novel exciton-based formalism for modeling the optical response of asymmetric semiconductor nanostructures, capturing infinite-order effects and intraband fields, and successfully explains experimental four-wave mixing oscillations.

Contribution

It develops a new theoretical framework for excitonic responses in asymmetric nanostructures that includes infinite-order optical effects and intraband fields, advancing previous models.

Findings

Accurately explains oscillations in four-wave mixing signals

Achieves good agreement with experimental data

Provides a comprehensive formalism for asymmetric quantum wells

Abstract

We present a new exciton-based formalism for calculating the coherent response of asymmetric semiconductor multiple quantum well structures to ultra-short optical pulses valid to infinite order in the optical field and including the self-generated intraband fields. We use these equations to calculate and explain the oscillations with time delay of peaks in the spectrally-resolved degenerate four wave mixing signals from biased semiconductor superlattices, obtaining good agreement with experiment.