Mott Transitions in Two-Orbital Hubbard Systems(Yukawa International Seminar 2004 (YKIS2004) Physics of Strongly Correlated Electron Systems)
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概要
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We investigate the Mott transitions in two-orbital Hubbard systems. Applying the dynamical mean field theory and the self-energy functional approach, we discuss the stability of itinerant quasi-particle states in each band. It is shown that separate Mott transitions occur at different Coulomb interaction strengths in general. On the other hand, if some special conditions are satisfied for the interactions, spin and orbital fluctuations are equally enhanced at low temperatures, resulting in a single Mott transition. The phase diagrams are obtained at zero and finite temperatures. We also address the effect of the hybridization between two orbitals, which induces the Kondo-like heavy fermion states in the intermediate orbital-selective Mott phase.
- 理論物理学刊行会の論文
- 2006-02-06
著者
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KOGA Akihisa
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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Kawakami Norio
Department Of Physics Kyoto University:department Of Applied Physics Osaka University
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Kawakami Norio
Department Of Applied Physics Osaka University
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INABA Kensuke
Department of Applied Physics, Osaka University
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Inaba Kensuke
Department Of Applied Physics Osaka University
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Koga Akihisa
Department of Physics, Kyoto University
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Kawakami Norio
Department of Physics, Kyoto University:Department of Applied Physics, Osaka University
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