A two-site Kitaev chain in a two-dimensional electron gas

Sebastiaan L. D. Haaf, Qingzhen Wang, A. Mert Bozkurt, Chun-Xiao Liu, Ivan Kulesh, Philip Kim, Di Xiao, Candice Thomas, Michael J. Manfra, Tom Dvir, Michael Wimmer and Srijit Goswami ()
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Sebastiaan L. D. Haaf: Delft University of Technology
Qingzhen Wang: Delft University of Technology
A. Mert Bozkurt: Delft University of Technology
Chun-Xiao Liu: Delft University of Technology
Ivan Kulesh: Delft University of Technology
Philip Kim: Delft University of Technology
Di Xiao: Purdue University
Candice Thomas: Purdue University
Michael J. Manfra: Purdue University
Tom Dvir: Delft University of Technology
Michael Wimmer: Delft University of Technology
Srijit Goswami: Delft University of Technology

Nature, 2024, vol. 630, issue 8016, 329-334

Abstract: Abstract Artificial Kitaev chains can be used to engineer Majorana bound states (MBSs) in superconductor–semiconductor hybrids1–4. 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.

Date: 2024
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DOI: 10.1038/s41586-024-07434-9

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