Majorana Bound States in Double Nanowires with Reduced Zeeman Thresholds due to Supercurrents

Abstract

We study the topological phase diagram of a setup composed of two nanowires with strong Rashba spin-orbit interaction subjected to an external magnetic field and brought into the proximity to a bulk $s$-wave superconductor in the presence of a supercurrent flowing through it. The supercurrent reduces the critical values of the Zeeman energy and crossed Andreev superconducting pairing required to reach the topological phase characterized by the presence of one Majorana bound state localized at each system end. We demonstrate that, even in the regime of the crossed Andreev pairing being smaller than the direct proximity pairing, a relatively weak magnetic field drives the system into the topological phase due to the presence of the supercurrent.

10 pages, 7 figures

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• Majorana bound states in germanium Josephson junctions via phase control
• Off-diagonal long-range order in the ground state of the Kitaev chain
• Unconventional topological transitions in a self-organized magnetic ladder
• Effects of Peierls phases in open linear chains
• Supercurrent-Induced Weyl Superconductivity
• Platform for controllable Majorana zero modes using superconductor/ferromagnet heterostructures
• Lifshitz transitions and Weyl semimetals from a topological superconductor with supercurrent flow
• Superconducting triangular islands as a platform for manipulating Majorana zero modes
• Polarity of the fermionic condensation in the $p$-wave Kitaev model on a square lattice
• Localization and Topology in Noncentrosymmetric Superconductors with Disorder
• Electronic transport in double-nanowire superconducting islands with multiple terminals