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@ARTICLE{Liebsch:7686,
      author       = {Liebsch, A. and Tong, N.-H.},
      title        = {{F}inite-temperature exact diagonalization cluster
                      dynamical mean-field study of the two-dimensional {H}ubbard
                      model: {P}seudogap, non-{F}ermi-liquid behavior, and
                      particle-hole asymmetry},
      journal      = {Physical review / B},
      volume       = {80},
      number       = {16},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-7686},
      pages        = {165126},
      year         = {2009},
      note         = {N.- H. T. is supported by the Alexander von Humboldt
                      Foundation. The computational work was carried out on the
                      Julich JUMP.},
      abstract     = {The effect of doping in the two-dimensional Hubbard model
                      is studied within finite-temperature exact diagonalization
                      combined with cluster dynamical mean-field theory. By
                      employing a mixed basis involving cluster sites and bath
                      molecular orbitals for the projection of the lattice Green's
                      function onto 2 x 2 clusters, a considerably more accurate
                      description of the low-frequency properties of the
                      self-energy is achieved than in a pure site picture. To
                      evaluate the phase diagram, the transition from Fermi-liquid
                      to non-Fermi-liquid behavior for decreasing hole doping is
                      studied as a function of Coulomb energy,
                      next-nearest-neighbor hopping, and temperature. The
                      self-energy component Sigma(X) associated with X=(pi, 0) is
                      shown to develop a collective mode above E-F, whose energy
                      and strength exhibits a distinct dispersion with doping.
                      This low-energy excitation gives rise to non-Fermi-liquid
                      behavior as the hole doping decreases below a critical value
                      delta(c), and to an increasing particle-hole asymmetry, in
                      agreement with recent photoemission data. This behavior is
                      consistent with the removal of spectral weight from electron
                      states above EF and the opening of a pseudogap, which
                      increases with decreasing doping. The phase diagram reveals
                      that delta(c) approximate to 0.15... 0.20 for various system
                      parameters. For electron doping, the collective mode of
                      Sigma(X)(omega) and the concomitant pseudogap are located
                      below the Fermi energy, which is consistent with the removal
                      of spectral weight from the hole states just below E-F. The
                      critical doping, which marks the onset of non-Fermi-liquid
                      behavior, is systematically smaller than for hole doping.},
      keywords     = {J (WoSType)},
      cin          = {IFF-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB781},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000271352100062},
      doi          = {10.1103/PhysRevB.80.165126},
      url          = {https://juser.fz-juelich.de/record/7686},
}