Non-Equilibrium Charge Dynamics in Majorana-Josephson Devices

TL;DR

This paper explores how Majorana bound states influence charge transport in Josephson devices, revealing new dynamic behaviors and potential for non-equilibrium phenomena in topological superconducting systems.

Contribution

It introduces a detailed analysis of charge dynamics in Majorana-Josephson devices, highlighting the qualitative changes caused by Majorana states compared to conventional systems.

Findings

Diminished role of Bloch oscillations

Single-particle tunnelling dominates charge transport

Rich behaviors in static and dynamic regimes

Abstract

We investigate the impact of introducing Majorana bound states, formed by a proximitized semiconducting nanowire in the topological regime, into a current biased capacitive Josephson junction, thereby adding delocalized states below the superconducting gap. We find that this qualitatively changes the charge dynamics of the system, diminishing the role of Bloch oscillations and causing single-particle tunnelling effects to dominate. We fully characterize the resulting charge dynamics and the associated voltage and current signals. Our work reveals a rich landscape of behaviours in both the static and time-varying driving modes. This can be directly attributed to the presence of Majorana bound states, which serve as a pathway for charge transport and enable non-equilibrium excitations of the Majorana-Josephson device.