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- W3103103655 abstract "The x-ray magnetic circular dichroism (XMCD) sum rule yields an extremely useful ground-state observable, which provides a quantitative measure of spontaneous time-reversal symmetry breaking (T-breaking) in a given material. I derive here its explicit expression within band-structure theory, in the general case: trivial insulators, topological insulators, and metals. Orbital magnetization provides a different measure of T-breaking in the electronic ground state. The two observables belong to the class of geometrical observables; both are local and admit a density in coordinate space. In both of them one could include/exclude selected groups of bands, in order to acquire element-specific information about the T-breaking material. Only in the case of an isolated flat band the contributions to the two observables coincide. Finally, I provide the corresponding geometrical formula-in a different Hilbert space-for a many-body interacting system." @default.
- W3103103655 created "2020-11-23" @default.
- W3103103655 creator A5079091287 @default.
- W3103103655 date "2020-05-08" @default.
- W3103103655 modified "2023-10-02" @default.
- W3103103655 title "Magnetic circular dichroism versus orbital magnetization" @default.
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- W3103103655 doi "https://doi.org/10.1103/physrevresearch.2.023139" @default.
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