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Journal Articles Nature Communications Year : 2019

Isolated pairs of Majorana zero modes in a disordered superconducting lead monolayer

Abstract

Majorana zero modes are fractional quantum excitations appearing in pairs, each pair being a building block for quantum computation. Some signatures of Majorana zero modes have been reported at endpoints of one-dimensional systems, which are however required to be extremely clean. An alternative are two-dimensional topological superconductors, such as the Pb/Co/Si(111) system shown recently to be immune to local disorder. Here, we use scanning tunneling spectroscopy to characterize a disordered superconducting monolayer of Pb coupled to underlying Co-Si magnetic islands. We show that pairs of zero modes are stabilized: one zero mode positioned in the middle of the magnetic domain and its partner extended all around the domain. The zero mode pair is remarkably robust, isolated within a hard superconducting gap. Our theoretical scenario supports the protected Majorana nature of this zero mode pair, highlighting the role of magnetic or spin-orbit coupling textures.
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Dates and versions

hal-03060026 , version 1 (04-01-2021)

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Gerbold Ménard, Andrej Mesaros, Christophe Brun, François Debontridder, Dimitri Roditchev, et al.. Isolated pairs of Majorana zero modes in a disordered superconducting lead monolayer. Nature Communications, 2019, 10 (1), pp.2587. ⟨10.1038/s41467-019-10397-5⟩. ⟨hal-03060026⟩
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