Periodic Anderson Model with Degenerate Orbitals: Linearized Dynamical Mean Field Theory Approach
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- Sato Ryota
- Department of Applied Physics, Osaka University
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- Ohashi Takuma
- Department of Applied Physics, Osaka University
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- Koga Akihisa
- Department of Applied Physics, Osaka University
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- Kawakami Norio
- Department of Applied Physics, Osaka University
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Abstract
We investigate a multi-orbital extension of the periodic Anderson model with particular emphasis on electron correlations including orbital fluctuations. By means of a linearized version of the dynamical mean-field theory, we compute the renormalization factor, the density of states, the spectral gap and the local correlation functions for a given set of the intra- and inter-orbital Coulomb interactions as well as the Hund coupling. It is found that when a certain condition is met for the intra- and inter-orbital interactions for f electrons, orbital fluctuations are enhanced, thereby enlarging the Kondo insulating gap. This effect is suppressed in the presence of the Hund coupling. We also clarify how the Kondo insulator is continuously changed to the Mott insulator when electron correlations among conduction electrons are increased.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 73 (7), 1864-1869, 2004
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679163931392
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- NII Article ID
- 110001954903
- 210000104918
- 130004538832
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- NII Book ID
- AA00704814
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- BIBCODE
- 2004JPSJ...73.1864S
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 7004405
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed