Low-field Topological Threshold in Majorana Double Nanowires

Abstract

A hard proximity-induced superconducting gap has recently been observed in semiconductor nanowire systems at low magnetic fields. However, in the topological regime at high magnetic fields, a soft gap emerges and represents a fundamental obstacle to topologically protected quantum information processing with Majorana bound states. Here we show that in a setup of double Rashba nanowires that are coupled to an s-wave superconductor and subjected to an external magnetic field along the wires, the topological threshold can be significantly reduced by the destructive interference of direct and crossed-Andreev pairing in this setup, precisely down to the magnetic field regime in which current experimental technology allows for a hard superconducting gap. We also show that the resulting Majorana bound states exhibit sufficiently short localization lengths, which makes them ideal candidates for future braiding experiments.

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Cited by in corpus (32)

• Majorana Kramers pairs in higher-order topological insulators
• Metallization of Rashba wire by superconducting layer in the strong-proximity regime
• Majorana bound states in semiconducting nanostructures
• Finite-size effects in a nanowire strongly coupled to a thin superconducting shell
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• Majorana Kramers pairs in Rashba double nanowires with interactions and disorder
• Helical Liquids in Semiconductors
• Kramers pairs of Majorana corner states in a topological insulator bilayer
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