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Properties and prevalence of false poor man's Majoranas in two- and three-site artificial Kitaev chains

Melina Luethi1, Henry F. Legg1,2,*, Daniel Loss1, and Jelena Klinovaja1

  • *Contact author: hl29@st-andrews.ac.uk
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Phys. Rev. B 112, 205426 – Published 25 November, 2025

DOI: https://doi.org/10.1103/bg4z-vx9m

Abstract

A minimal chain of two quantum dots (QDs) connected via a superconductor has been predicted to host perfectly localized zero-energy states, known as poor man's Majoranas (PMMs). These states are expected to be related to Majorana bound states (MBSs) in longer chains and that the tunable nature of this setup makes it a promising platform to study MBSs. However, realistic systems can only host highly, but not perfectly, localized near-zero-energy states, called imperfect PMMs. These imperfect PMMs have been shown to evolve into trivial states unrelated to MBSs when the chain is extended. Such states are called false PMMs, whereas PMMs that evolve into MBSs in long chains are called true PMMs. Here, using a microscopic model of QD-superconductor arrays, we consider properties of false PMMs and the circumstances under which they appear. In two-site systems, we find that the origin of many false PMMs can be related to zero-energy states occurring in the absence of superconductivity, and we use this analytic understanding to characterize the false PMMs that are typical for different regions of parameter space. In three-site systems, we show that false PMMs can occur via the same mechanism as for two-site systems, but we also find them in regions of parameter space where they are not predicted to exist, thus hinting that the physics of false PMMs can be richer in longer chains. Finally, we demonstrate that the PMMs most stable to perturbations in chemical potential and with the largest excitation gaps appear in a region of parameter space that also has a large ratio of false to true PMMs.

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Phys. Rev. B 112, 205426– Published 25 November, 2025
  • Received 30 April 2025
  • Revised 9 September 2025
  • Accepted 22 September 2025
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