Nonlocal correlations transmitted between quantum dots via short topological superconductor

TL;DR

This paper investigates how nonlocal correlations mediated by Majorana modes in a topological superconductor can influence quantum dots, revealing molecular states and nonlocal effects accessible via spectroscopy, relevant to recent experimental models.

Contribution

It introduces a detailed analysis of nonlocal correlations in a quantum dot-topological superconductor hybrid, highlighting the emergence of molecular states due to Majorana mode overlap.

Findings

Identification of molecular states caused by Majorana overlap

Prediction of nonlocal effects detectable by crossed Andreev reflection

Relevance to recent experimental realizations of the Kitaev model

Abstract

We study the quasiparticle states and nonlocal correlations of a hybrid structure, comprising two quantum dots interconnected through a short-length topological superconducting nanowire hosting overlaping Majorana modes. We show that the hybridization between different components of this setup gives rise to the emergence of molecular states, which are responsible for nonlocal correlations. We inspect the resulting energy structure, focusing on the inter-dependence between the quasiparticles of individual quantum dots. We predict the existence of nonlocal effects, which could be accessed and probed by crossed Andreev reflection spectroscopy. Our study would be relevant to a recent experimental realization of the minimal Kitaev model [T. Dvir et al., Nature 614, 445 (2023)], by considering its hybrid structure with side-attached quantum dots.