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@ARTICLE{Hollmann:874811,
      author       = {Hollmann, Arne and Struck, Tom and Langrock, Veit and
                      Schmidbauer, Andreas and Schauer, Floyd and Leonhardt, Tim
                      and Sawano, Kentarou and Riemann, Helge and Abrosimov,
                      Nikolay V. and Bougeard, Dominique and Schreiber, Lars},
      title        = {{L}arge, {T}unable {V}alley {S}plitting and {S}ingle-{S}pin
                      {R}elaxation {M}echanisms in a {S}i / {S}i x {G}e 1 − x
                      {Q}uantum {D}ot},
      journal      = {Physical review applied},
      volume       = {13},
      number       = {3},
      issn         = {2331-7019},
      address      = {College Park, Md. [u.a.]},
      publisher    = {American Physical Society},
      reportid     = {FZJ-2020-01659},
      pages        = {034068},
      year         = {2020},
      abstract     = {Valley splitting is a key feature of silicon-based spin
                      qubits. Quantum dots in Si/SixGe1−x heterostructures
                      reportedly suffer from a relatively low valley splitting,
                      limiting the operation temperature and the scalability of
                      such qubit devices. Here, we demonstrate a robust and large
                      valley splitting exceeding 200 μeV in a gate-defined single
                      quantum dot, hosted in molecular-beam-epitaxy-grown
                      68Si/SixGe1−x. The valley splitting is monotonically and
                      reproducibly tunable up to $15\%$ by gate voltages,
                      originating from a 6-nm lateral displacement of the quantum
                      dot. We observe static spin relaxation times T1>1 s at low
                      magnetic fields in our device containing an integrated
                      nanomagnet. At higher magnetic fields, T1 is limited by the
                      valley hotspot and by phonon noise coupling to intrinsic and
                      artificial spin-orbit coupling, including phonon
                      bottlenecking.},
      cin          = {PGI-2 / PGI-11},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-2-20110106 / I:(DE-Juel1)PGI-11-20170113},
      pnm          = {144 - Controlling Collective States (POF3-144)},
      pid          = {G:(DE-HGF)POF3-144},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000522199100002},
      doi          = {10.1103/PhysRevApplied.13.034068},
      url          = {https://juser.fz-juelich.de/record/874811},
}