Altermagnetic Skyrmions in 2D Lattices Exhibiting Anisotropic Skyrmion Hall Effect

TL;DR

This paper demonstrates the existence of anisotropic skyrmion Hall effect in 2D altermagnetic antiferromagnets, revealing a new mechanism for skyrmion dynamics influenced by symmetry and current orientation.

Contribution

It introduces altermagnetic skyrmions in 2D systems and elucidates the symmetry-based mechanism behind anisotropic skyrmion Hall effect, supported by theoretical and computational analysis.

Findings

A-SkHE observed in 2D altermagnetic systems.

Identified symmetry-protected anisotropic field as stabilizer.

Quantitative relationship between skyrmion velocity and current orientation.

Abstract

Anisotropic skyrmion Hall effect (A-SkHE) in two-dimensional (2D) magnetic systems represents a captivating phenomenon in condensed-matter physics and materials science. While conventional antiferromagnetic systems inherently suppress this effect through parity-time symmetry-mediated cancellation of Magnus forces acting on skyrmions, A-SkHE is primarily confined to ferromagnetic platforms. Here, we present a paradigm-shifting demonstration of this phenomenon in spin-splitting 2D antiferromagnets through the investigation of altermagnetic skyrmions. Combining comprehensive symmetry analysis with theoretical modeling, we elucidate the mechanism governing A-SkHE realization in 2D altermagnetic systems and establish a quantitative relationship between the transverse velocity of altermagnetic skyrmions and applied current orientation. Using first-principles calculations and micromagnetic simulations, this mechanism is further illustrated in a prototypical altermagnetic monolayer V2SeTeO. Crucially, we identify that the [C2C4zt] symmetry-protected anisotropic field serves as the critical stabilizer for maintaining the A-SkHE in this system. Our results greatly enrich the research on 2D altermagnetism and skyrmions.