Heavy Quasi-Particles in the Two-Orbital Hubbard Model
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概要
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The two-orbital Hubbard model with the Hund coupling is investigated in a metallic phase close to the Mott insulator. We calculate the one-particle spectral function and the optical conductivity within dynamical mean field theory, for which the effective impurity problem is solved by using the non-crossing approximation. For a metallic system close to quarter filling, a heavy quasi-particle band is formed by the Hubbard interaction, the effective mass of which is not so sensitive to the orbital splitting and the Hund coupling. In contrast, a heavy quasi-particle band near half filling disappears in the presence of the orbital splitting, but is induced again by the introduction of the Hund coupling, resulting in a different type of heavy quasi-particles.
- Physical Society of Japanの論文
- 2001-08-15
著者
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Kawakami Norio
Department Of Applied Physics Osaka University
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Imai Yoshiki
Department Of Applied Physics Osaka University
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Imai Yoshiki
Department of Applied Physics, Osaka University, Suita, Osaka 565-0871
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Kawakami Norio
Department of Applied Physics, Osaka University, Suita, Osaka 565-0871
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