Experimental evidence on the Altshuler-Aronov-Spivak interference of the topological surface states in the exfoliated Bi2Te3 nanoflakes

TL;DR

This study provides experimental evidence of AAS interference in topological surface states of exfoliated Bi2Te3 nanoflakes, showing how transport regimes change with sample width and temperature through magnetoresistance oscillations.

Contribution

It demonstrates the presence of AAS interference in topological surface states and explores the transition from ballistic to diffusive transport regimes.

Findings

Observation of h/e and h/2e oscillations in magnetoresistance.

Dominance of h/2e AAS oscillations with increasing width and temperature.

Transition of Dirac fermion transport from ballistic to diffusive.

Abstract

Here we demonstrate the Altshuler-Aronov-Spivak (AAS) interference of the topological surface states on the exfoliated Bi2Te3 microflakes by a flux period of h/2e in their magnetoresistance oscillations and its weak field character. Both the osillations with the period of h/e and h/2e are observed. The h/2e-period AAS oscillation gradually dominates with increasing the sample widths and the temperatures. This reveals the transition of the Dirac Fermions' transport to the diffusive regime.