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@ARTICLE{Zeller:281512,
      author       = {Zeller, Rudolf},
      title        = {{D}irac {G}reen function for angular projection potentials},
      journal      = {Journal of physics / Condensed matter},
      volume       = {27},
      number       = {46},
      issn         = {1361-648X},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2016-01201},
      pages        = {465201 -},
      year         = {2015},
      abstract     = {The aim of this paper is twofold: first, it is shown that
                      the angular dependence of the Dirac Green function can be
                      described analytically for potentials with non-local
                      dependence on the angular variables if they are chosen as
                      projection potentials in angular momentum space. Because the
                      local dependence on the radial variable can be treated to
                      any precision with present computing capabilities, this
                      means that the Green function can be calculated practically
                      exactly. Second, it is shown that a result of this kind not
                      only holds for a single angular projection potential but
                      also more generally, for instance if space is divided into
                      non-overlapping cells and a separate angular projection
                      potential is used in each cell. This opens the way for
                      relativistic density-functional calculations within a
                      different perspective than the conventional one. Instead of
                      trying to obtain the density for a given potential
                      approximately as well as possible, the density is determined
                      exactly for non-local potentials which can approximate
                      arbitrary local potentials as well as desired},
      cin          = {IAS-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-3-20090406},
      pnm          = {144 - Controlling Collective States (POF3-144)},
      pid          = {G:(DE-HGF)POF3-144},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000365346700005},
      doi          = {10.1088/0953-8984/27/46/465201},
      url          = {https://juser.fz-juelich.de/record/281512},
}