Chiral-symmetry protected exceptional torus in correlated nodal-line semimetals

We analyze a diamond-lattice Hubbard model with the spatially modulated Hubbard interaction. Our dynamical mean-field analysis with special emphasis on non-Hermitian properties elucidates that the gapless nodal line changes into symmetry-protected exceptional torus (SPET) at the Fermi level enclosin...

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Bibliographic Details
Published in:Physical review. B 2019-09, Vol.100 (11), p.1, Article 115124
Main Authors: Kimura, Kazuhiro, Yoshida, Tsuneya, Kawakami, Norio
Format: Article
Language:English
Subjects:
Correlation analysis
Diamonds
Fermi surfaces
Magnetic permeability
Mean field theory
Metalloids
Symmetry
Toruses
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Summary:We analyze a diamond-lattice Hubbard model with the spatially modulated Hubbard interaction. Our dynamical mean-field analysis with special emphasis on non-Hermitian properties elucidates that the gapless nodal line changes into symmetry-protected exceptional torus (SPET) at the Fermi level enclosing the three-dimensional open Fermi surface, which is unique to non-Hermitian physics with chiral symmetry. Furthermore, we also elucidate the effects of the SPETs on the magnetic response; our results based on the random-phase approximation combined with the dynamical mean-field theory show that SPETs enhance the magnetic susceptibility at the weakly correlated sites, exemplifying effects of non-Hermitian degeneracies on responses to external fields.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.115124