% 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{Qahosh:1050019,
      author       = {Qahosh, Mohammed},
      title        = {{S}pin-orbital mixing in the topological ladder of the
                      two-dimensional metal {P}t{T}e2},
      volume       = {118},
      school       = {Duisburg-Essen},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2025-05733},
      isbn         = {978-3-95806-872-8},
      series       = {Schriften des Forschungszentrums Jülich Reihe Information
                      / Information},
      pages        = {170},
      year         = {2025},
      note         = {Dissertation, Duisburg-Essen, 2025},
      abstract     = {Spin polarization is a fundamental concept in condensed
                      matter physics, with key implications for theory and
                      spintronics. Unlike charge-based electronics, spintronics
                      exploits electrons’ intrinsic spin, enabling faster and
                      more energy-efficient information processing. However,
                      accurately characterizing intrinsic spin properties is
                      challenging due to interactions between initial electronic
                      states and final-state effects during experimental
                      measurements. This thesis addresses these challenges using
                      advanced high-resolution spin- and angle-resolved
                      photoelectron spectroscopy (spin-ARPES), a powerful
                      technique that provides comprehensive two-dimensional
                      mapping of spin textures, allowing for a more accurate
                      assessment of intrinsic spin characteristics across
                      electronic states. This research focuses on PtTe2, a type-II
                      Dirac semimetal with topological surface states that
                      collectively form a so-called topological ladder. By
                      visualizing its spin textures, we highlight the nature of
                      its spin polarization. PtTe2 has exceptional properties,
                      such as the highest room-temperature electrical conductivity
                      among metallic transition metal dichalcogenides. Its high
                      spin-orbit torque efficiency also leads to substantial spin
                      Hall conductivity in thin films, making it well-suited for
                      wafer-scale spintronic applications. Various experimental
                      geometries were employed to evaluate how surface symmetries
                      and light incidence angles influence spin polarization. When
                      light impinges on the sample within a mirror plane,
                      symmetric spin-polarized maps align with corresponding
                      initial-state calculations. Conversely, asymmetries emerge
                      in measured spin textures of surface and bulk states when a
                      mirror plane is absent, deviating from initial-state
                      predictions. Some observed asymmetries arise from the
                      intrinsic asymmetric bulk crystal structure, accessible
                      through the surface sensitivity of spin-ARPES, particularly
                      within the hidden spin-polarization phenomenon. Others stem
                      from geometryrelated factors, where the absence of a
                      relevant mirror plane introduces phase shifts in the
                      photoemission matrix element, leading to these asymmetries.
                      Additionally, calculations reveal that spin-orbit coupling
                      (SOC) scattering-induced spin polarization accounts for up
                      to $15\%$ of the total observed $50\%$ polarization in
                      PtTe2, that is revealed based on the adapted experimental
                      geometry. Furthermore, findings extend to the related
                      compound PdTe2, where similar behaviors reinforce the
                      applicability of the developed methodologies. By addressing
                      ambiguities in spin texture observations, this research
                      provides critical insights into the nature of spin
                      polarization and its implications for the efficient design
                      of spinbased devices. Ultimately, this thesis enhances the
                      fundamental understanding of intrinsic spin properties in
                      SOC materials, paving the way for their integration into
                      next-generation spintronic technologies.},
      cin          = {PGI-6},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {5211 - Topological Matter (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5211},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.34734/FZJ-2025-05733},
      url          = {https://juser.fz-juelich.de/record/1050019},
}