Probing Majorana localization in minimal Kitaev chains through a quantum dot - Aix-Marseille Université
Pré-Publication, Document De Travail Année : 2023

Probing Majorana localization in minimal Kitaev chains through a quantum dot

Résumé

Artificial Kitaev chains, formed by quantum dots coupled via superconductors, have emerged as a promising platform for realizing Majorana bound states. Even a minimal Kitaev chain (a quantum dot--superconductor--quantum dot setup) can host Majorana states at discrete sweet spots. However, unambiguously identifying Majorana sweet spots in such a system is still challenging. In this work, we propose an additional dot coupled to one side of the chain as a tool to identify good sweet spots in minimal Kitaev chains. When the two Majorana states in the chain overlap, the extra dot couples to both and thus splits an even--odd ground-state degeneracy when its level is on resonance. In contrast, a ground-state degeneracy will persist for well-separated Majorana states. This difference can be used to identify points in parameter space with spatially separated Majorana states, using tunneling spectroscopy measurements. We perform a systematic analysis of different relevant situations. We show that the additional dot can help distinguishing between Majorana sweet spots and other trivial zero-energy crossings. We also characterize the different conductance patterns, which can serve as a guide for future experiments aiming to study Majorana states in minimal Kitaev chains.

Dates et versions

hal-04290315 , version 1 (16-11-2023)

Identifiants

Citer

Rubén Seoane Souto, Athanasios Tsintzis, Martin Leijnse, Jeroen Danon. Probing Majorana localization in minimal Kitaev chains through a quantum dot. 2023. ⟨hal-04290315⟩

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