A two-site Kitaev chain in a two-dimensional electron gas
S.L.D. ten Haaf (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab)
Q. Wang (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Goswami Lab)
A.M. Bozkurt (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Wimmer Group)
C. Liu (TU Delft - QRD/Wimmer Group, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
I. Kulesh (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Goswami Lab)
Philip Kim (Student TU Delft)
Di Xiao (Purdue University)
Candice Thomas (Purdue University)
Michael J. Manfra (Purdue University)
T. Dvir (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
M.T. Wimmer (TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Wimmer Group, Kavli institute of nanoscience Delft)
S. Goswami (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab)
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Abstract
Artificial Kitaev chains can be used to engineer Majorana bound states (MBSs) in superconductor–semiconductor hybrids1,2,3,4. In this work, we realize a two-site Kitaev chain in a two-dimensional electron gas by coupling two quantum dots through a region proximitized by a superconductor. We demonstrate systematic control over inter-dot couplings through in-plane rotations of the magnetic field and via electrostatic gating of the proximitized region. This allows us to tune the system to sweet spots in parameter space, where robust correlated zero-bias conductance peaks are observed in tunnelling spectroscopy. To study the extent of hybridization between localized MBSs, we probe the evolution of the energy spectrum with magnetic field and estimate the Majorana polarization, an important metric for Majorana-based qubits5,6. The implementation of a Kitaev chain on a scalable and flexible two-dimensional platform provides a realistic path towards more advanced experiments that require manipulation and readout of multiple MBSs.