Transport Studies in Gate-Tunable Multi-Terminal Josephson Junctions*

Josephson junctions with three or more superconducting leads are predicted to exhibit topological physics in the presence of few conducting modes within the interstitial normal material.[1][2] Such topological behavior manifests itself as signatures in the complex transport properties between the different terminals, with topological phase transitions occurring as a function of phase and voltage bias.[3] Here we study the superconducting and resistive properties of top-gated multi-terminal Josephson devices, based on an InAs 2DEG proximitized with epitaxial aluminum. The top gate is used to deplete the 2DEG, and resistances are analyzed under various bias currents and magnetic fields.

1. Riwar et al. Nature Communications 7, 11167 (2016)
2. Xie et al. Phys. Rev. B 96, 161406(R) (2017)
3. Meyer et al. Phys. Rev. Lett. 119, 136807 (2017)