Modulation of Majorana-Induced Current Cross-Correlations by Quantum Dots

TL;DR

This paper investigates how quantum dots coupled to a topological superconductor with Majorana states influence charge transport and noise patterns, revealing unique nonlocal correlations due to crossed Andreev reflection.

Contribution

It demonstrates a distinct four-peaked noise pattern in the presence of Majorana states, contrasting with simpler patterns without them.

Findings

Four-peaked clover-like noise pattern due to Majorana states

Distinct nonlocal shot noise signatures from crossed Andreev reflection

Different noise patterns compared to non-Majorana systems

Abstract

We study charge transport through a topological superconductor with a pair of Majorana end states, coupled to leads via quantum dots with resonant levels. The non-locality of the Majorana bound states opens the possibility of crossed Andreev reflection with nonlocal shot noise, due to the injection of an electron into one end of the superconductor followed by the emission of a hole at the other end. In the space of energies of the two resonant quantum dot levels, we find a four peaked clover-like pattern for the strength of noise due to crossed Andreev reflection, distinct from the single ellipsoidal peak found in the absence of Majorana bound states.