Theory of Quantum Materials and Solid State Quantum Technologies

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Most experimental claims of Majorana bound states rest on the observation of a persistent zero bias peak (ZBP) in tunneling spectra. In our paper, we provide comprehensive evidence that the ZBPs observed in the experiments with semiconductor nanowires fully coated with a superconducting shell are not of Majorana origin. Instead, our theory demonstrates that ZBPs can be explained in terms of Yu-Shiba-Rusinov states (a special type of Andreev bound state) that originate in the tunneling region owing to the competition between electron correlations and superconductivity.

New publication in Science “Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states”
5 July, 2021 ramon
In this review, we discuss the main properties of Andreev and Majorana bound states, state-of-the-art techniques for their detection and theoretical progress beyond minimal models, including different types of robust zero modes that may emerge without a band-topological transition.

Nature Review Physics “From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires”
21 December, 2020 ramon
Check out Ramon’s recent invited perspective article in Applied Physics Letters on hybrid semiconductor-superconductor qubits.

Invited perspective on hybrid semiconductor-superconductor qubits by Ramon Aguado in Applied Physics Letters
15 December, 2020 ramon

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