Possible Giant Orbital Paramagnetism in Nanometer Scale 2DEG Strips

TL;DR

This paper predicts that nanoscale 2DEG strips under magnetic and electric fields exhibit giant orbital paramagnetism due to drift motion of electrons, suggesting a new magnetic material based on orbital electronic effects.

Contribution

It introduces a theoretical model showing large paramagnetic effects in nanoscale 2DEG strips, a novel phenomenon not previously described.

Findings

Large paramagnetic effects emerge at low temperatures in nanoscale 2DEG strips.

Magnetization is described as a difference between orbital paramagnetism and altered diamagnetism.

Proposes a new heterostructured magnetic material based on orbital motion in 2DEG strips.

Abstract

An elementary calculation shows that Landau diamagnetism becomes significantly altered and very large paramagnetic effects emerge at low temperature in nanoscale 2DEG strips penetrated by a perpendicular applied magnetic field and bounded by a parabolic potential, such as may arise from negative voltage applied to a split gate. These novel results are described by an expression which manifests the total system magnetization as a difference between evolved orbital paramagnetism and altered diamagnetism. These predicted effects correspond to drift motion of electrons parallel to the strip length arising from Landau eigenstates that are non-degenerate in the combined presence of a perpendicular applied magnetic field and electric fields associated with a confining parabolic potential. A new heterostructured magnetic material based on orbital electronic motion in 2DEG strips is proposed.