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ファイル
言語
英語
著者
Masuyama, Aya
内容記述(抄録等)
We have investigated the effects of the Coulomb interaction between conduction electrons on the excitation gap of the Kondo insulator. As a theoretical model of the Kondo insulator, the periodic Anderson model (PAM) has been used under particle–hole symmetry. We have treated the PAM with the Coulomb interaction between the conduction electrons, denoted by Uc, using the dynamic mean-field theory (DMFT) with the iterated perturbation theory as the DMFT impurity solver. With increasing Uc, the gap of the density of states at absolute zero widens and the characteristic temperature at which the electronic state begins to be reconstructed increases. We have found, via the perturbative approach, that the gap in the theoretical model of the Kondo insulator is widened by Uc, at least in the weak-coupling regime.
掲載誌名
Journal of the Physical Society of Japan
89
4
ISSN
0031-9015
ISSN(Online)
1347-4073
発行日
2020-03-23
DOI
出版者
The Physical Society of Japan
資料タイプ
学術雑誌論文
ファイル形式
PDF
著者版/出版社版
著者版
業績ID
e37450
部局
総合理工学部