The dependence of topological Anderson insulator on the type of disorder

TL;DR

This study explores how different types of disorder, specifically Anderson and bond disorder, affect the emergence of topological Anderson insulators in two-dimensional systems, revealing that the disorder type critically influences phase transitions.

Contribution

It provides a comparative analysis of the effects of Anderson and bond disorder on topological phase transitions using Born approximation theory.

Findings

Bond disorder influences topological phase transition differently than Anderson disorder.

The type of disorder determines the formation of topological Anderson insulators.

Results impact doping strategies in topological insulator fabrication.

Abstract

This paper details the investigation of the influence of different disorders in two-dimensional topological insulator systems. Unlike the phase transitions to topological Anderson insulator induced by normal Anderson disorder, a different physical picture arises when bond disorder is considered. Using Born approximation theory, an explanation is given as to why bond disorder plays a different role in phase transition than does Anderson disorder. By comparing phase diagrams, conductance, conductance fluctuations, and the localization length for systems with different types of disorder, a consistent conclusion is obtained. The results indicate that a topological Anderson insulator is dependent on the type of disorder. These results are important for the doping processes used in preparation of topological insulators.