Topological Complex Charge Conservation in Nontrivial Z2 × Z2 Domain Walls

• Published in: Advanced materials (Weinheim) Vol. 36; no. 25; pp. e2313803 - n/a
• Main Authors: Lee, Jhinhwan, Park, Hae‐Ryong, Jin, Kyung‐Hwan, Kim, Jun Sung, Cheong, Sang‐Wook, Yeom, Han‐Woong
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.06.2024
• Subjects: Apexes; Bifurcations; conservation of topological charge; Domain walls; Fermions; Hypothetical particles; Particle theory; Solitary waves; STM; topological complex charge; Topology; translative domain walls
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.202313803

Localized topological modes such as solitons, Majorana Fermions, and skyrmions are attracting great interest as robust information carriers for future devices. Here, a novel conserved quantity for topological domain wall networks of a Z2 × Z2 order generated with spin‐polarized current in Sr2VO3FeAs is discovered. 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. A novel conserved quantity for topological domain wall networks of a generic Z2 × Z2 order is discovered. Spin‐polarized current generates and mobilizes Z2 × Z2 domain walls in Sr2VO3FeAs, leading to merge, bifurcation, pair creation, and annihilation. Within these active dynamics, the product of the topological complex charges defined for domain wall vertices is conserved with a novel boundary‐charge correspondence rule.