The chiral edge modes of a topological superconductor support two
types of excitations: fermionic quasiparticles known as Majorana
fermions and \bm\pi𝛑-phase
domain walls known as edge vortices. Edge vortices are injected pairwise
into counter-propagating edge modes by a flux bias or voltage bias
applied to a Josephson junction. An unpaired edge mode carries zero
electrical current on average, but there are time-dependent current
fluctuations. We calculate the shot noise power produced by a sequence
of edge vortices and find that it increases logarithmically with their
spacing — even if the spacing is much larger than the core size so the
vortices do not overlap. This nonlocality produces an anomalous
\bm{V\ln V}𝐕ln𝐕
increase of the shot noise in a voltage-biased geometry, which serves as
a distinguishing feature in comparison with the
linear-in-\bm V𝐕
Majorana fermion shot noise.
Spin-polarized current and shot noise in a carbon nanotube quantum dot in the Kondo regime