Josephson Current in Rashba-based Superconducting Nanowires with Geometric Misalignment

TL;DR

This paper explores how geometric misalignment and external magnetic fields influence the Josephson current in Rashba-based superconducting nanowires, revealing tunable topological and transport properties for quantum device applications.

Contribution

It introduces a novel setup with misaligned nanowires to control Josephson current and topological states via geometric and magnetic parameters.

Findings

Josephson current amplitude and sign can be modulated by magnetic field and interface angle.

Geometric misalignment enables manipulation of interface states for coherent transport.

System can transition into a topologically non-trivial regime under magnetic field.

Abstract

We investigate the properties of a weak link between two Rashba-based superconducting nanowires with geometric misalignment. By applying an external magnetic field the system can be driven into a topological non-trivial regime. We demonstrate that the Josephson current can be modulated in amplitude and sign through the variation of the applied field and, remarkably, via the angle controlling the spin-orbit locking mismatch at the interface of the nanowires. The proposed setup with misaligned coplanar nanowires provides the building block configuration for the manipulation of coherent transport via geometric-controlled mixing/splitting of interface states.