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@ARTICLE{Jin:276183,
      author       = {Jin, F. and Steinigeweg, R. and Heidrich-Meisner, F. and
                      Michielsen, K. and De Raedt, H.},
      title        = {{F}inite-temperature charge transport in the
                      one-dimensional {H}ubbard model},
      journal      = {Physical review / B},
      volume       = {92},
      number       = {20},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-06650},
      pages        = {205103},
      year         = {2015},
      abstract     = {We study the charge conductivity of the one-dimensional
                      repulsive Hubbard model at finite temperature using the
                      method of dynamical quantum typicality, focusing at half
                      filling. This numerical approach allows us to obtain current
                      autocorrelation functions from systems with as many as 18
                      sites, way beyond the range of standard exact
                      diagonalization. Our data clearly suggest that the charge
                      Drude weight vanishes with a power law as a function of
                      system size. The low-frequency dependence of the
                      conductivity is consistent with a finite dc value and thus
                      with diffusion, despite large finite-size effects.
                      Furthermore, we consider the mass-imbalanced Hubbard model
                      for which the charge Drude weight decays exponentially with
                      system size, as expected for a nonintegrable model. We
                      analyze the conductivity and diffusion constant as a
                      function of the mass imbalance and we observe that the
                      conductivity of the lighter component decreases
                      exponentially fast with the mass-imbalance ratio. While in
                      the extreme limit of immobile heavy particles, the
                      Falicov-Kimball model, there is an effective
                      Anderson-localization mechanism leading to a vanishing
                      conductivity of the lighter species, we resolve finite
                      conductivities for an inverse mass ratio of η≳0.25.},
      cin          = {JSC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / Manipulation and dynamics of quantum spin
                      systems $(jjsc09_20120501)$},
      pid          = {G:(DE-HGF)POF3-511 / $G:(DE-Juel1)jjsc09_20120501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000364017500004},
      doi          = {10.1103/PhysRevB.92.205103},
      url          = {https://juser.fz-juelich.de/record/276183},
}