Symmetry, Disorder and Transport Through Altermagnetic Quantum Dots and Their Antiferromagnetic Twins

TL;DR

This paper investigates the transport properties of altermagnetic quantum dots and their antiferromagnetic counterparts, focusing on how symmetry, shape, and disorder influence effects like the anomalous Hall and spin-Hall effects.

Contribution

It provides a theoretical analysis of how symmetry and disorder affect transport phenomena in altermagnetic quantum dots, a novel class of materials with spin-split bands.

Findings

Symmetry and shape significantly influence the anomalous Hall and spin-Hall effects.

Disorder impacts spin filtering and transport properties in these quantum dots.

Altermagnetic quantum dots exhibit unique transport behaviors distinct from traditional antiferromagnets.

Abstract

Altermagnetic crystals resemble antiferromagnets in that they have no macroscopic magnetization, but unlike antiferromagnets they exhibit spin-split band structures. Here the transport properties of altermagnetic quantum dots and their antiferromagnetic twins are explored theoretically with the help of Landauer-Buttiker theory, symmetry considerations and tight-binding models. The influence of the symmetries of the quantum dots, their parent crystal lattices, their shapes and edges, lead arrangements and disorder on the anomalous Hall effect, the spin-Hall effect and spin filtering by the quantum dots are investigated.