Tunable Crossed Andreev Reflection and Elastic Cotunneling in Hybrid Nanowires
Alberto Bordin (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)
Guanzhong Wang (TU Delft - QRD/Wimmer Group, Kavli Institute for Theoretical Sciences, TU Delft - QuTech Advanced Research Centre)
Chun Xiao Liu (Kavli institute of nanoscience Delft, TU Delft - QRD/Wimmer Group, TU Delft - QuTech Advanced Research Centre)
Sebastiaan L.D. Ten Haaf (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab)
Nick Van Loo (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)
Grzegorz P. Mazur (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Wimmer Group)
Di Xu (TU Delft - BUS/Quantum Delft, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
David Van Driel (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)
Francesco Zatelli (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)
Sasa Gazibegovic (Eindhoven University of Technology)
Ghada Badawy (Eindhoven University of Technology)
Erik P.A.M. Bakkers (Eindhoven University of Technology)
Michael Wimmer (TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Wimmer Group, Kavli institute of nanoscience Delft)
Leo P. Kouwenhoven (TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Kouwenhoven Lab, Kavli institute of nanoscience Delft)
Tom Dvir (TU Delft - Qubit Research Division, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
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Abstract
A short superconducting segment can couple attached quantum dots via elastic cotunneling (ECT) and crossed Andreev reflection (CAR). Such coupled quantum dots can host Majorana bound states provided that the ratio between CAR and ECT can be controlled. Metallic superconductors have so far been shown to mediate such tunneling phenomena, albeit with limited tunability. Here, we show that Andreev bound states formed in semiconductor-superconductor heterostructures can mediate CAR and ECT over mesoscopic length scales. Andreev bound states possess both an electron and a hole component, giving rise to an intricate interference phenomenon that allows us to tune the ratio between CAR and ECT deterministically. We further show that the combination of intrinsic spin-orbit coupling in InSb nanowires and an applied magnetic field provides another efficient knob to tune the ratio between ECT and CAR and optimize the amount of coupling between neighboring quantum dots.
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