A two-site Kitaev chain in a two-dimensional electron gas
成果类型：
Article
署名作者：
ten Haaf, Sebastiaan L. D.; Wang, Qingzhen; Bozkurt, A. Mert; Liu, Chun-Xiao; Kulesh, Ivan; Kim, Philip; Xiao, Di; Thomas, Candice; Manfra, Michael J.; Dvir, Tom; Wimmer, Michael; Goswami, Srijit
署名单位：
Delft University of Technology; Delft University of Technology; Purdue University System; Purdue University; Purdue University System; Purdue University; Purdue University in Indianapolis; Purdue University System; Purdue University
刊物名称：
Nature
ISSN/ISSBN：
0028-5905
DOI：
10.1038/s41586-024-07434-9
发表日期：
2024-06-13
关键词：
摘要：
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. We have implemented a two-site Kitaev chain in a two-dimensional electron gas by coupling quantum dots through Andreev bound states in a superconductor-semiconductor hybrid region.