Current enhancement through a time dependent constriction in fractional topological insulators

TL;DR

This paper investigates how a time-dependent constriction affects backscattering current in fractional topological insulators, revealing unique current enhancement that helps identify fractional quasiparticles and their tunneling processes.

Contribution

It introduces a method to distinguish fractional quasiparticles in topological insulators by analyzing current behavior under a time-dependent constriction.

Findings

Current is enhanced in fractional topological insulators due to dominant tunneling.

The tunneling process involves one or two quasiparticles depending on interactions.

The method allows unambiguous identification of fractional quasiparticles.

Abstract

We analyze the backscattering current induced by a time dependent constriction as a tool to probe fractional topological insulators. We demonstrate an enhancement of the total current for a fractional topological insulator induced by the dominant tunneling excitation, contrary to the decreasing present in the integer case for not too strong interactions. This feature allows to unambiguously identify fractional quasiparticles. Furthermore, the dominant tunneling processes, which may involve one or two quasiparticles depending on the interactions, can be clearly determined.