Topological Complex Charge Conservation in Nontrivial Z₂ × Z₂ Domain Walls

Abstract

Localized topological modes such as solitons, Majorana Fermions, and skyrmions are attracting great interest as robust information carriers for future devices. Here we discover a novel conserved quantity for topological domain wall networks of an Z2×Z2 order generated with spin‐polarized current in Sr2VO3FeAs. Domain walls are mobilized by the scanning tunneling current, which also observes in atomic scale active dynamics of domain wall vertices including merge, bifurcation, pair creation and annihilation. Within this dynamics, the product of the topological complex charges defined for domain wall vertices is conserved with a novel boundary‐charge correspondence rule. These results may open an avenue toward topological electronics based on domain wall vertices in generic Z2×Z2 systems.This article is protected by copyright. All rights reserved