Phase diagram of the disordered Kitaev chain with long range pairing connected to external baths

TL;DR

This paper explores how disorder affects the phase diagram of a long-range paired Kitaev chain connected to external baths, revealing reentrant topological phases and potential disorder-induced phase transitions.

Contribution

It provides the first detailed analysis of the interplay between disorder, topology, and long-range pairing in a driven open quantum system.

Findings

Reentrant behavior of the topological phase at limited disorder levels

Disorder-induced transition between massive and topological phases

Analysis of subgap modes, current, and correlations in the disordered chain

Abstract

We study the phase diagram of a disordered Kitaev chain with long-range pairing when connected to two metallic leads exchanging particles with external Lindblad baths. We (i) monitor the subgap modes at increasing disorder, (ii) compute the current flowing across the system at a finite voltage bias between the baths, and (iii) study the normal single particle lead correlations across the chain. Throughout our derivation, we evidence the interplay between disorder and topology. In particular, we evidence the reentrant behavior of the massive, topological phase at limited values of the disorder strength, similar to what happens in the short-range pairing Kitaev model. Our results suggest the possibility of a disorder-induced direct transition between the massive and the short-range topological phase of the long-range pairing Kitaev model.