Dynamic conductivity of symmetric three-barrier plane nanosystem in constant electric field

TL;DR

This paper develops a theoretical model for the dynamic conductivity of a three-barrier nanosystem under a constant electric field, aiming to optimize quantum cascade laser performance by identifying conditions for maximal radiation power.

Contribution

It introduces a new theoretical approach for analyzing dynamic conductivity in three-barrier nanosystems with varying effective masses under electric fields, relevant for quantum cascade lasers.

Findings

Existence of a minimal electric field for optimal laser operation

Maximal electromagnetic radiation power at specific geometric configurations

Enhanced understanding of electron transport in heterostructures

Abstract

The theory of dynamic conductivity of nanosystem is developed within the model of rectangular potentials and different effective masses of electron in open three-barrier resonance-tunnel structure in a constant homogeneous electric field. The application of this theory for the improvement of operating characteristics of quantum cascade laser active region (for the experimentally investigated In$_{0.53}$Ga$_{0.47}$As/In$_{0.52}$Al$_{0.48}$As heterosystem) proves that for a certain geometric design of nanosystem there exists such minimal magnitude of constant electric field intensity, at which the electromagnetic field radiation power together with the density of current flowing through the separate cascade of quantum laser becomes maximal.