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@ARTICLE{Willmes:1049133,
      author       = {Willmes, Alexander and Bethke, Patrick and Shehata, M.
                      Mohamed El Kordy and Simion, George and Wolfe, M. A. and
                      Botzem, Tim and McNeil, Robert P. G. and Ritzmann, Julian
                      and Ludwig, Arne and Wieck, Andreas D. and Schuh, Dieter and
                      Bougeard, Dominique and Bluhm, Hendrik},
      title        = {{E}xchange interaction in gate-defined quantum dots beyond
                      the {H}ubbard model},
      publisher    = {arXiv},
      reportid     = {FZJ-2025-05225},
      year         = {2025},
      abstract     = {A quantitative description of the exchange interaction in
                      quantum dots is relevant for modeling gate operations of
                      spin qubits. By measuring the amplitude and frequency of
                      exchange-driven qubit state oscillations, we measure the
                      detuning dependence of the exchange coupling in a GaAs
                      double quantum dot over three orders of magnitude. Both 1D
                      and 3D full configuration interaction simulations can
                      replicate the observed behavior. Extending a Hubbard model
                      by including excited states increases the range of detuning
                      where it provides a good fit, thus elucidating the
                      underlying physics.},
      keywords     = {Mesoscale and Nanoscale Physics (cond-mat.mes-hall) (Other)
                      / Quantum Physics (quant-ph) (Other) / FOS: Physical
                      sciences (Other)},
      cin          = {PGI-11},
      cid          = {I:(DE-Juel1)PGI-11-20170113},
      pnm          = {5221 - Advanced Solid-State Qubits and Qubit Systems
                      (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5221},
      typ          = {PUB:(DE-HGF)25},
      doi          = {10.48550/ARXIV.2511.23277},
      url          = {https://juser.fz-juelich.de/record/1049133},
}