Cooper pair splitting in a two-dimensional electron gas I: Probing virtual processes

ORAL

Abstract

Cooper pair splitting (CPS) has been studied extensively in semiconductor-superconductor hybrids. However, it has thus far been challenging to isolate CPS from other local and non-local processes, such as local Andreev reflection and elastic co-tunnelling (ECT). Recent studies in hybrid nanowires [1] demonstrate that these challenges can be overcome to achieve highly efficient Cooper pair splitting. Here we present the first demonstration of CPS in a semiconductor two-dimensional electron gas. By coupling two quantum dots to the hybrid section via extended Andreev bound states, and operating the dots as charge filters, we achieve a CPS efficiency up to 95% , on par with the highest reported values. Using the two spin-degenerate, single-orbital dot levels, we observe specific spin blockades that are strongly dependent on the applied bias polarities and the nature of the underlying non-local virtual processes.



[1] Wang, G., et al., arXiv:2205.03458 (2022)

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Presenters

  • Qingzhen Wang

    • Delft University of Technology

Authors

  • Qingzhen Wang

    • Delft University of Technology

  • Sebastiaan ten Haaf

    • Delft University of Technology

  • Ivan Kulesh

    • QuTech (Delft University of Technology)
    • Delft University of Technology

  • Di Xiao

    • Department of Physics and Astronomy, Purdue University
    • Purdue University

  • Candice Thomas

    • Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University,
    • Department of Physics and Astronomy and Birck Nanotechnology Center, Purdue University

  • Michael J Manfra

    • Purdue University, Microsoft Quantum Purdue
    • Purdue University
    • Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA; Microsoft Quantum Lab, Purdue University, West Lafayette, IN, USA
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Birck Nanotechnology Center, School of Electrical and Computer Engineering and Microsoft Quantum Lab West Lafayette, Purdue University
    • Department of Physics and Astronomy and Nanotechnology Center Purdue University, Microsoft Quantum Lab West Lafayette
    • Department of Physics and Astronomy, Birck Nanotechnology Center, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University

  • Srijit Goswami

    • QuTech (Delft University of Technology)
    • Delft University of Technology