Shot-noise and differential conductance as signatures of putative topological superconductivity in FeSeTe
arXiv:2110.02238 · doi:10.1103/PhysRevB.105.L220504
Abstract
We present a theory for the differential shot noise, , as measured via shot-noise scanning tunneling spectroscopy, and the differential conductance, , for tunneling into Majorana zero modes (MZMs) in the putative topological superconductor FeSeTe. We demonstrate that for tunneling into chiral Majorana edge modes near domain walls, as well as MZMs localized in vortex cores and at the end of defect lines, vanishes whenever reaches a quantized value proportional to the quantum of conductance. These results are independent of the particular orbital tunneling path, thus establishing a vanishing concomitant with a quantized , as universal signatures for Majorana modes in two-dimensional topological superconductors, irrespective of the material's specific complex electronic bandstructure.
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