Majorana bound state in the continuum: Coupling between Majorana bound state and quantum dot mediated by continuum

TL;DR

This paper investigates how a Majorana bound state can leak into a quantum dot through a continuum, revealing a novel mechanism for creating bound states in the continuum with potential implications for topological quantum computing.

Contribution

It demonstrates a continuum-mediated coupling between Majorana bound states and quantum dots, leading to a new way to realize bound states in the continuum.

Findings

Leakage of MBS into continuum is achievable.

Continuum-mediated coupling alters Coulomb blockade physics.

Robust mechanism for bound state in the continuum is identified.

Abstract

In this work, we consider a single-level quantum dot (QD) and a Majorana bound state (MBS) placed at the end of a topological superconducting nanowire (TSW). Both are coupled to the continuum and do not have a direct connection between them. We addressed the behavior of MBS leaking phenomena and its consequences into the QD physics in non-interacting and Coulomb blockade regime. By employing Green's function formalism via the equation of motion procedure, we calculate the physical quantities of interest. Our results show that the leakage of the MBS into the continuum state is achieved and can alter the physics of Coulomb blockade in the system through continuum-mediated coupling between MBS and QD. As a main consequence, we found a robust and non-trivial mechanism to accomplish a bound state in the continuum in the system.