Unconventional Josephson Effect in Hybrid Superconductor-Topological Insulator Devices

TL;DR

This paper investigates unique transport phenomena in superconductor-topological insulator Josephson junctions, revealing unconventional scaling behaviors and magnetic field responses, supported by a phenomenological theoretical model.

Contribution

It introduces a phenomenological model explaining two novel effects observed in topological insulator Josephson junctions, expanding current theoretical understanding.

Findings

Inverse scaling of characteristic energy with junction width

Low magnetic field required to suppress supercurrent

Proposed phenomenological model explains observed effects

Abstract

We report on transport properties of Josephson junctions in hybrid superconducting-topological insulator devices, which show two striking departures from the common Josephson junction behavior: a characteristic energy that scales inversely with the width of the junction, and a low characteristic magnetic field for suppressing supercurrent. To explain these effects, we propose a phenomenological model which expands on the existing theory for topological insulator Josephson junctions.