% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@PHDTHESIS{Heers:18538,
      author       = {Heers, Swantje},
      title        = {{E}ffect of spin-orbit scattering on transport properties
                      of low-dimensional dilute alloys},
      volume       = {31},
      school       = {RWTH Aachen},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-18538},
      isbn         = {978-3-89336-747-4},
      series       = {Schriften des Forschungszentrums Jülich.
                      Schlüsseltechnologien / Key Technologies},
      pages        = {VIII, 216 S.},
      year         = {2011},
      note         = {Record converted from JUWEL: 18.07.2013; RWTH Aachen,
                      Diss., 2011},
      abstract     = {The scoppe of this thesis is to gain insight, by means of
                      $\textit{ab initio}$-calculations, into the physics of
                      monumentum and spin relaxation phenomena induced by electron
                      scattering at impurities and defects in the noble metals
                      copper, silver and gold. The main results are subdivided in
                      three parts. In the first part, momentum- and
                      spin-relaxation times due to scattering at $\textit{3d,
                      4sp,4d, 5sp, 5d}$ adn $\textit{6sp}$ impurities in copper
                      and gold fcc bulk are invetigated. The inversion symmetry of
                      the crystls leads to a two-fold degeneracy of all states on
                      the Fermi surfae, adn therefore spin relaxaation is
                      dominated by the elliott-Yafet mechanism as well as the
                      spin-orbit coupling of the impurity. For impurities in gold
                      , we calculate much shorter spin-relaxation times than in
                      copper because of the stronger spin-orbit coupling of the
                      fold host. Furthermore, we have found important qualitative
                      differences between the relaxation times obtained for the
                      $\textit{d-}$ and the $\textit{sp-}$impurities. As
                      scattering at $\textit{d-}$impurities is resonant, the
                      electrons spend much more time at the impurity sites than in
                      the case of the $\textit{sp-}$impurities; therefore, they
                      are much longer exhibited to the spin-orbit coupling of the
                      impurity. This results in considerably shorter
                      spin-relaxation times, even if the momentum scattering rates
                      are in the same order of magnitude. Finally, the
                      investigation of interference of scattering processes at
                      impurity dimers reveals that relevant differences to the
                      independent-impurity approximation appear only for strong
                      $\textit{d-}$scatterer, palced at nearest neighbouringsites.
                      in the second part we investigate the reduction of
                      spin-conservng surface-state lifetimes induced by adatom-
                      and impurity-scattering on the (111) surfaces of copper,
                      silver and gold films with different thickness. We have
                      found strong qualitative differences in the lifetimes when
                      comparing the results for adatoms to those of impurities in
                      the first and second layer. The trends for the latter ones
                      are similar to those calculated in bulk in the first part of
                      the thesis. In the third part, we investigate spin-orbit
                      induced effects on thin (001) and (111) copper and gold
                      films with focus on spin-relaxation mechanisms. We consider
                      both symmetric and asymmetric systems, where the asymmetry
                      of the latter ones is created by covering one side of the
                      film with one layer of Zn. For the symmetric films,
                      spin-mixing parameters and momentum- and spin-relaxation
                      times due to scattering at self-adatoms are calculated.
                      Whereas the largest spin-mixing in (111) films has been
                      obtained for the surface states, on the Fermi surfaces of
                      the (001) films spin hot spots occur, which are caused by
                      anticrossings of bands and lead to locally very high spin
                      mixing.},
      cin          = {PGI-1 / IAS-1},
      ddc          = {500},
      cid          = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)IAS-1-20090406},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/18538},
}