Shot noise in a Majorana fermion chain

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Abstract

We calculate the shot noise power in a junction of a network of Majorana bound states (MBSs) with a normal metal. These Majorana bound states are on the borders of alternating ferromagnetic and superconducting regions at the quantum spin Hall insulator edge. We analyze different realizations of MBS networks including a few isolated ones and those in a chain allowing for the limits of weak and strong tunneling. The conductance and the shot noise are considerably stronger than those of a weakly coupled normal-superconducting junction, which is a hallmark of the MBS. We find that the Fano factor is quantized, F=2, when one MBS member of a pair is coupled to the lead; however, if both MBS members are coupled F is noninteger.

Original languageEnglish
Article number153415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number15
DOIs
StatePublished - 22 Apr 2011

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