Kavli Affiliate: Michael Wimmer
| First 5 Authors: Sebastiaan L. D. ten Haaf, Qingzhen Wang, A. Mert Bozkurt, Chun-Xiao Liu, Ivan Kulesh
| Summary:
Artificial Kitaev chains can be used to engineer Majorana bound states (MBSs)
in superconductor-semiconductor hybrids. In this work, we realize a two-site
Kitaev chain in a two-dimensional electron gas (2DEG) by coupling two quantum
dots (QDs) 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 qubits. The implementation
of a Kitaev chain on a scalable and flexible 2D platform provides a realistic
path towards more advanced experiments that require manipulation and readout of
multiple MBSs.
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