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Electronic modes emerge within the band gap at nonzero temperature in strongly correlated insulators, exhibiting momentum-shifted magnetic dispersion relations from the band edges. Here, the origin of the emergent modes, their relation to doping-induced modes, and how their spectral weights increase with temperature are clarified in the ladder and bilayer Hubbard models and one- and two-dimensional Kondo lattice models using effective theory for weak inter-unit-cell hopping and numerical calculations. The results indicate that temperature-driven changes in the band structure reflecting spin excitation, including the change in the number of bands, can be observed in various strongly correlated insulators even with a spin gap, provided that the temperature increases up to about spin-excitation energies. The controlled analyses developed in this study significantly contribute to the fundamental understanding of the band structure of strongly correlated insulators at nonzero temperature.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: Strongly correlated systems, Mott insulators, Kondo insulators, Electronic structure, Temperature, Perturbation theory, Spin gap

Date published: 2024-07-08

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 1550235X) vol. 110 issue. 3 035123

Funding:

• Japan Society for the Promotion of Science JP22K03477
• Ministry of Education, Culture, Sports, Science and Technology World Premier International Research Center Initiative (WPI)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1103/physrevb.110.035123

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Updated at: 2024-07-12 16:30:22 +0900

Published on MDR: 2024-07-12 16:30:22 +0900