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Author
Fujita, Shohei Interdisciplinary Faculty of Science and Engineering, Shimane University, Matsue 690-8504, Japan
Kusunose, Hiroaki Department of Physics, Ehime University, Matsuyama 790-8577, Japan
Description
The spin and the charge excitations of the Kondo insulator are investigated based on the periodic Anderson model at half-filling.We employ the self-consistent fluctuation approximation, where the two-particle correlation functions and the effective irreducible vertices are determined self-consistently to satisfy the Pauli principle. When the system approaches the antiferromagnetic critical point with the strong electron correlation, the spin excitation spectrum is enhanced while the charge excitation spectrum is suppressed. The characteristic energy of the spin excitation is more strongly renormalized than that of the charge one.
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References
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(11)) Spectra t Im χ0 and t Im χs at T/t = 0.3 have small negative values below ω/t≲0.2, which are the artifact of the Padé approximation, and they have been omitted in drawing of Fig. 5.
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Subject
Kondo insulator
two-particle excitations
self-consistent fluctuation approximation
Journal Title
JPS Conference Proceedings
Volume
3
ISSN
2435-3892
Published Date
2014
DOI
Publisher
一般社団法人日本物理学会
Publisher Transcription
イッパン シャダン ホウジン ニホン ブツリ ガッカイ
Publisher Aalternative
The Physical Society of Japan
NII Type
Journal Article
Format
PDF
Rights
©2014 The Physical Society of Japan
Text Version
著者版
Gyoseki ID
e26215
OAI-PMH Set
Faculty of Science and Engineering