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- W4213106306 abstract "Excitonic insulators are usually considered to form via the condensation of a soft charge mode of bound electron-hole pairs. This, however, presumes that the soft exciton is of spin-singlet character. Early theoretical considerations have also predicted a very distinct scenario, in which the condensation of magnetic excitons results in an antiferromagnetic excitonic insulator state. Here we report resonant inelastic x-ray scattering (RIXS) measurements of Sr3Ir2O7. By isolating the longitudinal component of the spectra, we identify a magnetic mode that is well-defined at the magnetic and structural Brillouin zone centers, but which merges with the electronic continuum in between these high symmetry points and which decays upon heating concurrent with a decrease in the material's resistivity. We show that a bilayer Hubbard model, in which electron-hole pairs are bound by exchange interactions, consistently explains all the electronic and magnetic properties of Sr3Ir2O7 indicating that this material is a realization of the long-predicted antiferromagnetic excitonic insulator phase." @default.
- W4213106306 created "2022-02-24" @default.
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- W4213106306 date "2022-02-17" @default.
- W4213106306 modified "2023-10-15" @default.
- W4213106306 title "Antiferromagnetic excitonic insulator state in Sr3Ir2O7" @default.
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- W4213106306 doi "https://doi.org/10.1038/s41467-022-28207-w" @default.
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