Coupled Real- and Momentum-Space Topology in Symmetry-Locked Bilayer Altermagnet

TL;DR

This paper introduces a novel bilayer altermagnet system that combines real-space and momentum-space topological features, enabling new topological phases, stable antiskyrmions, and potential applications in low-power spintronics.

Contribution

It presents a symmetry-locked bilayer altermagnet that simultaneously hosts multiple topological states and stable antiskyrmions with longitudinal motion, addressing the Hall angle issue in charge-neutral skyrmions.

Findings

Strain-triggered transitions to Weyl semimetal phase.

Coupled antiskyrmion pairs with compensated charges.

Longitudinal antiskyrmion motion without Hall deflection.

Abstract

Integrating real-space topological spin textures with momentum-space topological electronic states within a single altermagnetic system has remained a persistent challenge. Here, we introduce a symmetry-locked bilayer altermagnet that concurrently hosts d-wave altermagnetism, momentum-space topology, and stable antiskyrmions. In momentum-space, it enables strain-triggered transitions to an antiferromagnetic Weyl semimetal phase, where the N\'eel vector acts as a switch for spin-layer-polarized quantum anomalous Hall and Weyl states, alongside coupled topological states and valley polarization effects. In real-space, the formation of interlayer co-directional and locked in-plane Dzyaloshinskii-Moriya interactions facilitates the creation of coupled antiskyrmion pairs with compensated topological charges. This locking symmetry fully cancels the transverse Magnus forces, resulting in current-driven, strictly longitudinal motion of antiskyrmions without any Hall-like deflection. Our work establishes a robust platform for dual-space topological magnetism and offers a definitive solution to the vanishing Hall angle in charge-neutral antiskyrmions, opening pathways toward high-density, low-power topological spintronics.