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Antiferromagnetic excitonic insulator state in Sr3Ir2O7.
Mazzone, D G; Shen, Y; Suwa, H; Fabbris, G; Yang, J; Zhang, S-S; Miao, H; Sears, J; Jia, Ke; Shi, Y G; Upton, M H; Casa, D M; Liu, X; Liu, Jian; Batista, C D; Dean, M P M.
Afiliación
  • Mazzone DG; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY, 11973, USA. daniel.mazzone@psi.ch.
  • Shen Y; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232, Villigen, Switzerland. daniel.mazzone@psi.ch.
  • Suwa H; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY, 11973, USA.
  • Fabbris G; Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan.
  • Yang J; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA.
  • Zhang SS; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA.
  • Miao H; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA.
  • Sears J; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA.
  • Jia K; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
  • Shi YG; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY, 11973, USA.
  • Upton MH; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
  • Casa DM; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
  • Liu X; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA.
  • Liu J; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA.
  • Batista CD; School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China. liuxr@shanghaitec.edu.cn.
  • Dean MPM; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA.
Nat Commun ; 13(1): 913, 2022 Feb 17.
Article en En | MEDLINE | ID: mdl-35177583
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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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido