Gate-Dependent Transport in Multi-Terminal Josephson Junctions*

Josephson coupling of three or more superconducting leads through a material with few conducting modes has been predicted to give rise to topological effects. Such behavior, of relevance for topologically-protected quantum bits, would lead to specific transport features measured between terminals, with topological phase transitions occurring as a function of relative phase and voltage biases. Here we study the effects on transport of several top-gating arrangements on multi-terminal Josephson junctions with many conducting modes based on an InAs 2DEG proximitized with an epitaxial aluminum layer and many conducting modes. The superconducting features can be accurately simulated by a network of RCSJ junctions. [1]

1. G. V. Graziano, J. S. Lee, M. Pendharkar, C. J. Palmstrom and V. S. Pribiag. arXiv:1905.11730 (2019)