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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