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@INPROCEEDINGS{Blgel:1047701,
      author       = {Blügel, Stefan},
      title        = {{T}owards {C}ryo-{S}pintornics},
      reportid     = {FZJ-2025-04467},
      year         = {2025},
      abstract     = {With the advent of quantum technology and quantum
                      computing, devices at cryogenic temperature become much more
                      wide spread. This also opens opportunities to include
                      superconducting interfaces into the scientific game. For
                      example, the combination of superconductors with magnetic or
                      topological materials offers a playground where new
                      phenomena such as topological superconductivity, Majorana
                      zero modes or superconducting spintronics can emerge. Sofar,
                      superconductivity was mostly investigated on the basis of
                      singles-band models. We changed this providing a materials
                      specific description of complex superconducting
                      heterostructures based on density functional theory by
                      developing the Kohn­ Sham Bogoliubov-de Gennes (KS-BdG)
                      method [1] into the Julich Korringa-Kohn-Rostoker
                      Greenfunction method UuKKR) [2]. By this we turn from a
                      single band model to multiband effects in hybrid structures,
                      which provides a new rich playground for unconventional
                      superconductivity. I briefly present our method and will
                      show several examples. One example is the Au/Al
                      heterostructure [3], which allows us to predict
                      finite-energy superconducting pairing due to the interplay
                      of the Rashba surface state of Au, with the hybridization to
                      the electronic structure of superconducting Al. We
                      investigate the nature of the induced superconducting
                      pairing, and we quantify its mixed singlet-triplet
                      character. Our findings demonstrate general recipes to
                      explore real material systems that exhibit interorbital
                      pairing away from the Fermi energy.AcknowledgementsThe work
                      was carried out with Philipp Rur3,mann and Bjorn
                      Trautzettel. Work was supported by the Deutsche
                      Forschungsgemeinschaft (DFG, German Research Foundation)
                      under Germany's Excellence Strategy-Cluster of Excellence
                      Matter and Light for Quantum Computing (ML4Q) EXC
                      2004/1-390534769 and through SFB-1238 (project C1) as well
                      as ERC grant 856538 (project "3D MAGIC").References[1] P.
                      Rüßmann and S. Blugel, Phys. Rev. B 105, 125143 (2022).[2]
                      P. Rüßmann, et al, JuDFTteam/aiida-spirit (2023
                      [10.5281/ZENODO. 8070769][3] P. Rüßmann et al., Phys. Rev.
                      Research 5, 043181 (2023).},
      organization  = {(Netherlands)},
      subtyp        = {Invited},
      cin          = {PGI-1},
      cid          = {I:(DE-Juel1)PGI-1-20110106},
      pnm          = {5211 - Topological Matter (POF4-521) / DFG project
                      G:(GEPRIS)390534769 - EXC 2004: Materie und Licht für
                      Quanteninformation (ML4Q) (390534769) / SFB 1238 C01 -
                      Strukturinversionsasymmetrische Materie und
                      Spin-Orbit-Phänomene mittels ab initio (C01) (319898210) /
                      3D MAGiC - Three-dimensional magnetization textures:
                      Discovery and control on the nanoscale (856538)},
      pid          = {G:(DE-HGF)POF4-5211 / G:(GEPRIS)390534769 /
                      G:(GEPRIS)319898210 / G:(EU-Grant)856538},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/1047701},
}