論文

査読有り
2020年2月

Relationship between exceptional points and the Kondo effect in f-electron materials

PHYSICAL REVIEW B
  • Yoshihiro Michishita
  • ,
  • Tsuneya Yoshida
  • ,
  • Robert Peters

101
8
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.101.085122
出版者・発行元
AMER PHYSICAL SOC

We study the impact of non-Hermiticity due to strong correlations in f -electron materials. One of the most remarkable phenomena occurring in non-Hermitian systems is the emergence of exceptional points at which the effective non-Hermitian Hamiltonian cannot be diagonalized. We here demonstrate that the temperature at which exceptional points appear around the Fermi energy is related to the Kondo temperature. For this purpose, we study the periodic Anderson model with local and nonlocal hybridization in the insulating and metallic regimes. By analyzing the effective non-Hermitian Hamiltonian, which describes the single-particle spectral function, and the temperature dependence of the magnetic moment, we show that exceptional points appear at the temperature at which the magnetic moment is screened. This temperature corresponds to the Kondo temperature. These results suggest that the well-known crossover between localized and itinerant f electrons in these materials is related to the emergence of exceptional points in the single-particle spectral function at the Fermi energy. Viewing exceptional points in the combined momentum-frequency space, we observe that the exceptional points in the effective Hamiltonian form a one-dimensional manifold which changes its structure around the Kondo temperature.

Web of Science ® 被引用回数 : 19

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.101.085122
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000513583000003&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevB.101.085122
  • ISSN : 2469-9950
  • eISSN : 2469-9969
  • Web of Science ID : WOS:000513583000003

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