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language
eng
Author
Masuyama, Aya
Description
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.
Journal Title
Journal of the Physical Society of Japan
Volume
89
Issue
4
ISSN
0031-9015
ISSN(Online)
1347-4073
Published Date
2020-03-23
DOI
Publisher
The Physical Society of Japan
NII Type
Journal Article
Format
PDF
Text Version
著者版
Gyoseki ID
e37450
OAI-PMH Set
Faculty of Science and Engineering