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Title: Topological and Quantum Magnetic Phases in 5d Ir-Oxides with Strong Spin-Orbit Coupling
Originating Office: IAS
Speaker: Yu, Jaejun
Issue Date: 16-Dec-2012
Event Date: 16-Dec-2012
Group/Series/Folder: Record Group 8.15 - Institute for Advanced Study
Series 3 - Audio-visual Materials
Location: 8.15:3 box 1.8
Notes: IAS Asia Pacific Workshop on Condensed Matter Physics. Talk no. 26
Title from title slide.
"̳e̳f̳f" & "̳F" are subscript.
Host: Institute for Advanced Study.
Sponsor: The Collaborative Research Fund (CRF), The Research Grants Council (RGC).
Abstract: A novel j̳e̳f̳f=1/2 state in Sr₂IrO₄ was reported as a unique manifestation of the spin-orbit coupling (SOC) and on-site Coulomb (U) interaction effect in 5d transition metal oxides. The electron correlation combined with strong SOC under a large crystal field present is responsible for the observed peculiar electronic and magnetic properties. We carried out LDA+SO+U calculations including both on-site U and SOC for 5d Ir oxide compounds including Sr₂IrO₄, Na₂IrO₃, and Li₂IrO₃. The results show that there is an interesting competition between local lattice distortion and spin-orbit coupling, which controls the degree of j̳e̳f̳f=1/2 components in the state near E̳F. We predict a topological quantum phase transition from normal to topological insulator in Na₂IrO₃, driven by the control of long-range hopping and trigonal crystal field. By fine-tuning the structural parameters in Ir-oxides, one can explore more interesting characteristics of transition metal oxides with competing strong SOC and Coulomb correlation. In addition, we observe that intriguing effective magnetic interactions arise from the strong spin-orbit coupling with on-site Coulomb interaction. Possible topological insulator and exotic magnetic phases suggest that Ir-oxide and related systems can be an "interesting" playground for the study of the interplay between spin-orbit coupling and on-site Coulomb interaction.
Duration: 37 min.
Appears in Series:8.15:3 - Audio-visual Materials
Videos for Public -- Distinguished Lectures