Modulated Helical Metals at Magnetic Domain Walls of Pyrochlore Iridium Oxides

Abstract

Spontaneous symmetry breakings, metal-insulator transitions, and transport properties of magnetic-domain-wall states in pyrochlore iridium oxides are studied by employing a symmetry adapted effective hamiltonian with a slab perpendicular to the (111) direction of the pyrochlore lattice. Emergent metallic domain wall, which has unconventional topological nature with a controllable and mobile metallic layer, is shown to host Fermi surfaces with modulated helical spin textures resembling Rashba metals. The helical nature of the domain-wall Fermi surfaces is experimentally detectable by anomalous Hall conductivity, circular dichroism, and optical Hall conductivity under external magnetic fields. Possible applications of the domain-wall metals to spin-current generation and "half-metallic" conduction are also discussed.

11 pages, 10 figures

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• Recent progress on correlated electron systems with strong spin-orbit coupling
• Domain Topology and Domain Switching Kinetics in a Hybrid Improper Ferroelectric
• All-in-all-out magnetic domain wall conduction in pyrochlore iridate heterointerface
• Topological Properties and Functionalities in Oxide Thin Films and Interfaces
• Non-collinear magnetic structure and multipolar order in Eu${}_2$Ir${}_2$O${}_7$
• Approaching the quantum critical point in a highly-correlated all-in-all-out antiferromagnet
• Shape of magnetic domain walls formed by coupling to mobile charges
• First-principles studies of spin-orbital physics in pyrochlore oxides
• Magnetotransport of single crystal Sm${}_2$Ir${}_2$O${}_7$ across the pressure-induced quantum-critical phase boundary
• Metal-insulator transitions in pyrochlore oxides