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@PHDTHESIS{Karrasch:63199,
      author       = {Karrasch, Christoph},
      othercontributors = {Meden, Volker},
      title        = {{T}he functional renormalization group for zero-dimensional
                      quantum systems in and out of equilibrium},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-124646},
      pages        = {219 S. : Ill., graph. Darst.},
      year         = {2010},
      note         = {Aachen, Techn. Hochsch., Diss., 2010},
      abstract     = {We study transport properties of quantum impurity systems
                      using the functional renormalization group. The latter is an
                      RG-based diagrammatic tool to treat Coulomb interactions in
                      a fast and flexible way. Prior applications, which employed
                      a simple first-order (Hartree-Fock-like) scheme to truncate
                      the FRG flow equations within the Matsubara formalism,
                      succeeded in accurately describing linear transport of
                      various quantum dot geometries at zero temperature T=0. In a
                      nutshell, advance in this Thesis is three-fold. First, we
                      introduce a frequency-dependent second-order approximation
                      in order to eventually compute finite-energy properties such
                      as the conductance at T>0 (mainly focusing on the single
                      impurity Anderson model). Second, a generalisation of the
                      Hartree-Fock-like approach to Keldysh space allows for
                      addressing the non-equilibrium steady-state dynamics of the
                      interacting resonant level model. Third, we investigate the
                      physics of a quantum dot Josephson junction as well as the
                      charging of a single narrow level using the first-order
                      scheme.},
      keywords     = {Renormierungsgruppe (SWD) / Quantenpunkt (SWD) /
                      Nichtgleichgewicht (SWD)},
      cin          = {130000 / 135820},
      ddc          = {530},
      cid          = {$I:(DE-82)130000_20140620$ / $I:(DE-82)135820_20140620$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-opus-33468},
      url          = {https://publications.rwth-aachen.de/record/63199},
}