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| language |
eng
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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
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| 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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| Description Alternative | References
1) G.Aeppli and Z.Fisk, Comments Condens. Matter Phys. 16, 155 (1992). 2) P. S.Riseborough, Adv. Phys. 49, 257 (2000). 10.1080/000187300243345 3) T.Moriya and A.Kawabata, J. Phys. Soc. Jpn. 34, 639 (1973) 10.1143/JPSJ.34.639; T.Moriya and A.Kawabata, J. Phys. Soc. Jpn. 35, 669 (1973). 10.1143/JPSJ.35.669 4) T.Moriya, Spin Fluctuations in Itinerant Electron Magnetism (Springer, Heidelberg, 1985). 5) A.Kawabata, J. Phys. F 4, 1477 (1974). 10.1088/0305-4608/4/9/019 6) T.Moriya and T.Takimoto, J. Phys. Soc. Jpn. 64, 960 (1995). 10.1143/JPSJ.64.960 7) J. A.Hertz, Phys. Rev. B 14, 1165 (1976). 10.1103/PhysRevB.14.1165 8) A. J.Millis, Phys. Rev. B 48, 7183 (1993). 10.1103/PhysRevB.48.7183 9) H.Kusunose, J. Phys. Soc. Jpn. 79, 094707 (2010) 10.1143/JPSJ.79.094707;H.Kusunose, J. Phys. Soc. Jpn. 80, SA137 (2011). 10.1143/JPSJS.80SA.SA137 10) N. D.Mermin and H.Wagner, Phys. Rev. Lett. 17, 1133 (1966). 10.1103/PhysRevLett.17.1133 (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. 12) T.Nishino and K.Ueda, Phys. Rev. B 47, 12451 (1993). 10.1103/PhysRevB.47.12451 |
| Subject | Kondo insulator
two-particle excitations
self-consistent fluctuation approximation
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| Journal Title |
JPS Conference Proceedings
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| Volume | 3
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| ISSN | 2435-3892
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| Published Date | 2014
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| DOI | |
| Publisher | 一般社団法人日本物理学会
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| Publisher Transcription | イッパン シャダン ホウジン ニホン ブツリ ガッカイ
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| Publisher Aalternative | The Physical Society of Japan
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| NII Type |
Journal Article
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| Format |
PDF
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| Rights | ©2014 The Physical Society of Japan
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| Text Version |
著者版
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| Gyoseki ID | e26215
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| OAI-PMH Set |
Faculty of Science and Engineering
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