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@ARTICLE{Volmer:1023044,
      author       = {Volmer, Mats and Struck, Tom and Sala, Arnau and Chen,
                      Bingjie and Oberländer, Max and Offermann, Tobias and Xue,
                      Ran and Visser, Lino and Tu, Jhih-Sian and Trellenkamp,
                      Stefan and Cywiński, Łukasz and Bluhm, Hendrik and
                      Schreiber, Lars R.},
      title        = {{M}apping of valley-splitting by conveyor-mode
                      spin-coherent electron shuttling},
      publisher    = {arXiv},
      reportid     = {FZJ-2024-01625},
      year         = {2023},
      abstract     = {In Si/SiGe heterostructures, the low-lying excited valley
                      state seriously limit operability and scalability of
                      electron spin qubits. For characterizing and understanding
                      the local variations in valley splitting, fast probing
                      methods with high spatial and energy resolution are lacking.
                      Leveraging the spatial control granted by conveyor-mode
                      spin-coherent electron shuttling, we introduce a method for
                      two-dimensional mapping of the local valley splitting by
                      detecting magnetic field dependent anticrossings of ground
                      and excited valley states using entangled electron
                      spin-pairs as a probe. The method has sub-μeV energy
                      accuracy and a nanometer lateral resolution. The histogram
                      of valley splittings spanning a large area of 210 nm by 18
                      nm matches well with statistics obtained by the established
                      but time-consuming magnetospectroscopy method. For the
                      specific heterostructure, we find a nearly Gaussian
                      distribution of valley splittings and a correlation length
                      similar to the quantum dot size. Our mapping method may
                      become a valuable tool for engineering Si/SiGe
                      heterostructures for scalable quantum computing.},
      keywords     = {Quantum Physics (quant-ph) (Other) / Mesoscale and
                      Nanoscale Physics (cond-mat.mes-hall) (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.2312.17694},
      url          = {https://juser.fz-juelich.de/record/1023044},
}