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005     20200311142958.0
024 7 _ |2 DOI
|a 10.1140/epjb/e2006-00248-0
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037 _ _ |a PreJuSER-54427
041 _ _ |a eng
082 _ _ |a 530
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|a Physics, Condensed Matter
100 1 _ |0 P:(DE-Juel1)VDB941
|a Liebsch, A.
|b 0
|u FZJ
245 _ _ |a Non-Fermi-liquid phases in the two-band Hubbard model: Finite-temperature exact diagonalization study of Hund's rule coupling
260 _ _ |a Berlin
|b Springer
|c 2006
300 _ _ |a 523
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336 7 _ |2 DRIVER
|a article
440 _ 0 |0 1982
|a European Physical Journal B
|v 51
|x 1434-6028
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a The two-band Hubbard model involving subbands of different widths is investigated via finite-temperature exact diagonalization (ED) and dynamical mean field theory (DMFT). In contrast to the quantum Monte Carlo (QMC) method which at low temperatures includes only Ising-like exchange interactions to avoid sign problems, ED permits a treatment of Hund's exchange and other onsite Coulomb interactions on the same footing. The role of finite-size effects caused by the limited number of bath levels in this scheme is studied by analyzing the low-frequency behavior of the subband self-energies as a function of temperature, and by comparing with numerical renormalization group (NRG) results for a simplified effective model. For half-filled, non-hybridizing bands, the metallic and insulating phases are separated by an intermediate mixed phase with an insulating narrow and a bad-metallic wide subband. The wide band in this phase exhibits different degrees of non-Fermi-liquid behavior, depending on the treatment of exchange interactions. Whereas for complete Hund's coupling, infinite lifetime is found at the Fermi level, in the absence of spin-flip and pair-exchange, this lifetime becomes finite. Excellent agreement is obtained both with new NRG and previous QMC/DMFT calculations. These results suggest that-finite temperature ED/DMFT might be a useful scheme for realistic multi-band materials.
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|a Non-equilibrium dynamics of fermionic atoms in optical lattices; transport at oxide interfaces (jiff23_20090701)
588 _ _ |a Dataset connected to Web of Science
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700 1 _ |0 P:(DE-Juel1)130600
|a Costi, T. A.
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773 _ _ |0 PERI:(DE-600)1459068-2
|a 10.1140/epjb/e2006-00248-0
|g Vol. 51, p. 523
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856 7 _ |u http://dx.doi.org/10.1140/epjb/e2006-00248-0
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