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000054427 084__ $$2WoS$$aPhysics, Condensed Matter
000054427 1001_ $$0P:(DE-Juel1)VDB941$$aLiebsch, A.$$b0$$uFZJ
000054427 245__ $$aNon-Fermi-liquid phases in the two-band Hubbard model: Finite-temperature exact diagonalization study of Hund's rule coupling
000054427 260__ $$aBerlin$$bSpringer$$c2006
000054427 300__ $$a523
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000054427 440_0 $$01982$$aEuropean Physical Journal B$$v51$$x1434-6028
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000054427 520__ $$aThe 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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000054427 536__ $$0G:(DE-Juel1)jiff23_20090701$$aNon-equilibrium dynamics of fermionic atoms in optical lattices; transport at oxide interfaces (jiff23_20090701)
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000054427 7001_ $$0P:(DE-Juel1)130600$$aCosti, T. A.$$b1$$uFZJ
000054427 773__ $$0PERI:(DE-600)1459068-2$$a10.1140/epjb/e2006-00248-0$$gVol. 51, p. 523$$p523$$q51<523$$tThe @European physical journal / B$$v51$$x1434-6028$$y2006
000054427 8567_ $$uhttp://dx.doi.org/10.1140/epjb/e2006-00248-0
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000054427 9141_ $$y2006
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