Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session V25: Spin-Orbit, Interface, and Domain Wall Physics in Magnetic Iridates
2:30 PM–5:30 PM,
Thursday, March 8, 2018
LACC Room: 403B
Sponsoring Units: GMAG DMP
Chair: Brian Kirby, NIST -Natl Inst of Stds & Tech
Abstract: V25.00004 : Metallicity and Topology in Iridate Domain Walls
4:18 PM–4:54 PM
(Univ of Tokyo)
(Univ of Tokyo)
Cooperation and competition between strong electron correlations and spin-orbit couplings have attracted much attention. Iridium oxides offer playgrounds for such an interplay and indeed exhibit intriguing phenomena. Especially, theoretical predictions on realization of topological Weyl semimetals had inspired extensive studies of pyrochlore iridates R2Ir2O7 (R: rare-earth elements). However, direct observation of Weyl electrons has hardly been realized in R2Ir2O7, yet.
To find routes to realize the topological quantum states in iridates, we studied low-energy effective hamiltonians of R2Ir2O7 and pyrochlore osmium oxides. By focusing on magnetic domain walls and employing a symmetry adapted effective hamiltonian of R2Ir2O7, we have proposed that, after pair-annihilation of Weyl electrons, magnetic domain walls in R2Ir2O7 host two-dimensional metallic states, which show metal-insulator transitions, optical Hall effects, and circular dichroism. We also examined properties of magnetic domain walls in pyrochlore osmium oxides in comparison with those in iridates.
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