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@ARTICLE{Liebsch:54427,
      author       = {Liebsch, A. and Costi, T. A.},
      title        = {{N}on-{F}ermi-liquid phases in the two-band {H}ubbard
                      model: {F}inite-temperature exact diagonalization study of
                      {H}und's rule coupling},
      journal      = {The European physical journal / B},
      volume       = {51},
      issn         = {1434-6028},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {PreJuSER-54427},
      pages        = {523},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {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.},
      keywords     = {J (WoSType)},
      cin          = {IFF-TH-III / IFF-TH-I / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB32 / I:(DE-Juel1)VDB30},
      pnm          = {Kondensierte Materie / Non-equilibrium dynamics of
                      fermionic atoms in optical lattices; transport at oxide
                      interfaces $(jiff23_20090701)$},
      pid          = {G:(DE-Juel1)FUEK414 / $G:(DE-Juel1)jiff23_20090701$},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000238670700008},
      doi          = {10.1140/epjb/e2006-00248-0},
      url          = {https://juser.fz-juelich.de/record/54427},
}