17-21 July 2017
Santiago de Compostela, Facultade de Química
Europe/Madrid timezone

Zero-energy pinning from interactions in Majorana nanowires

19 Jul 2017, 16:05
Aula Química Inorgánica (Facultad de Química (USC))

Aula Química Inorgánica

Facultad de Química (USC)

Quantum Materials and Technologies (GEFES) Quantum Materials and Technologies (GEFES) II


Dr. Pablo San-Jose (ICMM-CSIC)


Majorana zero modes at the boundaries of topological superconductors are charge-neutral, an equal superposition of electrons and holes. This ideal situation is, however, hard to achieve in physical implementations, such as proximitised semiconducting nanowires of realistic length. In such systems Majorana overlaps are unavoidable and lead to their hybridisation into charged Bogoliubov quasiparticles of finite energy which, unlike true zero modes, are affected by electronic interactions. We here demonstrate that these interactions, particularly with bound charges in the dielectric surroundings, drastically change the non-interacting paradigm. Remarkably, interactions may completely suppress Majorana hybridisation around parity crossings, where the total charge in the nanowire changes. This effect, dubbed zero-energy pinning, stabilises Majoranas back to zero energy and charge, and leads to electronically incompressible parameter regions wherein Majoranas remain insensitive to local perturbations, despite their overlap.

Primary author

Dr. Pablo San-Jose (ICMM-CSIC)


Prof. Alfredo Levy Yeyati (Universidad Autónoma de Madrid) Dr. Elsa Prada (Universidad Autónoma de Madrid) Dr. Fernando Domínguez (Universidad Autónoma de Madrid) Dr. Jorge Cayao (ICMM-CSIC) Prof. Ramón Aguado (ICMM-CSIC)

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