Shot noise distinguishes Majorana fermions from vortices injected in the edge mode of a chiral p-wave superconductor
C. W. J. Beenakker, D. O. Oriekhov
SciPost Phys. 9, 080 (2020) · published 23 November 2020
- doi: 10.21468/SciPostPhys.9.5.080
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Abstract
The chiral edge modes of a topological superconductor support two types of excitations: fermionic quasiparticles known as Majorana fermions and $\pi$-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 V log V increase of the shot noise in a voltage-biased geometry, which serves as a distinguishing feature in comparison with the linear-in-V Majorana fermion shot noise.
Cited by 6
Authors / Affiliation: mappings to Contributors and Organizations
See all Organizations.- European Research Council [ERC]
- Horizon 2020 (through Organization: European Commission [EC])
- Ministerie van Onderwijs, Cultuur en Wetenschap / Ministry of Education Culture and Science [OCW]
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek / Netherlands Organisation for Scientific Research [NWO]