Antiferromagnetic excitonic insulator state in Sr3Ir2O7

被引：0
作者：
D. G. Mazzone
Y. Shen
H. Suwa
G. Fabbris
J. Yang
S.-S. Zhang
H. Miao
J. Sears
Ke Jia
Y. G. Shi
M. H. Upton
D. M. Casa
X. Liu
Jian Liu
C. D. Batista
M. P. M. Dean
机构：
[1] Brookhaven National Laboratory,Department of Condensed Matter Physics and Materials Science
[2] Paul Scherrer Institut,Laboratory for Neutron Scattering and Imaging
[3] The University of Tokyo,Department of Physics
[4] University of Tennessee,Department of Physics and Astronomy
[5] Advanced Photon Source,Beijing National Laboratory for Condensed Matter Physics, Institute of Physics
[6] Argonne National Laboratory,School of Physical Science and Technology
[7] Materials Science and Technology Division,undefined
[8] Oak Ridge National Laboratory,undefined
[9] Chinese Academy of Sciences,undefined
[10] ShanghaiTech University,undefined
[11] Quantum Condensed Matter Division and Shull-Wollan Center,undefined
[12] Oak Ridge National Laboratory,undefined
来源：
Nature Communications | / 13卷
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摘要：
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.
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