Antiferromagnetic excitonic insulator state in Sr3Ir2O7

Author:

Mazzone D. G.ORCID,Shen Y.,Suwa H.ORCID,Fabbris G.ORCID,Yang J.,Zhang S.-S.,Miao H.ORCID,Sears J.,Jia Ke,Shi Y. G.,Upton M. H.,Casa D. M.,Liu X.,Liu JianORCID,Batista C. D.ORCID,Dean M. P. M.ORCID

Abstract

AbstractExcitonic 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.

Funder

DOE | SC | Basic Energy Sciences

National Science Foundation

National Natural Science Foundation of China

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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