Figure 1: General setup of the multi-terminal junction, and examples of typical ABS spectra.
From: Multi-terminal Josephson junctions as topological matter
(a) The superconducting leads with phases ϕα, α=0, …, n−1, are connected through a scattering region described by the scattering matrix 
. (b) Generic ABS energy spectrum versus ϕ1, away from a Weyl singularity. (c) ABS energy spectrum versus ϕ1, where the other phases are tuned to a Weyl singularity. Note the gap closing (red, dotted circle).
