Probing Majorana localization of a phase-controlled three-site Kitaev chain with an additional quantum dot
Alberto Bordin (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)
Florian J. Bennebroek Evertsz’ (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)
Bart Roovers (Kavli institute of nanoscience Delft, TU Delft - Medical Instruments & Bio-Inspired Technology)
Juan D. Torres Luna (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Wimmer Group)
Wietze D. Huisman (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab, Kavli institute of nanoscience Delft)
Francesco Zatelli (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)
Grzegorz P. Mazur (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Wimmer Group)
Sebastiaan L.D. ten Haaf (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Goswami Lab)
Chun Xiao Liu (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Nick van Loo (TU Delft - QRD/General, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Leo P. Kouwenhoven (TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
undefined More Authors (External organisation)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Few-site implementations of the Kitaev chain offer a minimal platform to study the emergence and stability of Majorana bound states. Here, we realize two- and three-site chains in semiconducting quantum dots coupled via superconductors, and tune them to the sweet spot where zero-energy Majorana modes appear at the chain ends. We demonstrate control of the superconducting phase through both magnetic field and sweet-spot selection, and fully characterize the excitation spectrum under local and global perturbations. All spectral features are identified using the ideal Kitaev chain model. To assess Majorana localization, we couple the system to an additional quantum dot. The absence of energy splitting at the sweet spot is compatible with high-quality Majorana modes, despite the modest chain size.
help_outline