Gigantic negative magnetoresistance of nanoheterostructures described by the Fivaz model

TL;DR

This paper demonstrates that nanoheterostructures modeled by the Fivaz model exhibit significant negative magnetoresistance under various degeneracy conditions, surpassing parabolic band models, due to spin effects and Landau quantization.

Contribution

It shows that negative magnetoresistance in nanoheterostructures described by the Fivaz model occurs under a wider range of conditions than previously known, highlighting the model's broader applicability.

Findings

Negative magnetoresistance appears under weak, intermediate, and strong degeneracy.

Fivaz model predicts larger negative magnetoresistance than parabolic band models.

Both spin splitting and Landau quantization contribute to the effect.

Abstract

It is shown that the negative magnetoresistance of nanoheterostructures described by the Fivaz model can become apparent not only under strong, but also under intermediate or weak degeneracy of free carrier gas in them. In so doing, in the Fivaz model it becomes apparent to a larger extent than in the case of a parabolic, though anisotropic, conduction band. The negative magnetoresistance can be both due to spin splitting and the Landau quantization proper.