Minimal Conductivity of Topological Surface States with Magnetic Impurities

TL;DR

This study investigates the transport properties of Dirac fermions on topological insulator surfaces with magnetic impurities, revealing a minimal conductivity similar to graphene and no Kondo effect at very low temperatures.

Contribution

It introduces a semiclassical Boltzmann approach to analyze magnetic impurity effects on topological surface states, highlighting the absence of Kondo anomalies at low temperatures.

Findings

Presence of minimal conductivity in topological surface states.

No Kondo effect observed for T > 10^{-6}K.

Transport properties resemble those of graphene.

Abstract

In this paper we use the semiclassical Boltzmann equation to investigate the transport properties of Dirac fermion on the surface of topological insulator with magnetic impurities. The results obtained show that there is also a minimal conductivity in this system as in graphene. We also argue the low temperature transport property, and find that there is no low temperature anomaly known as Kondo effect when the temperature is T>10^{-6}K.