Two-dimensional magnetotransport in Bi2Te2Se nanoplatelets

TL;DR

This study reports the synthesis of Bi2Te2Se nanoplates and demonstrates that their surface states exhibit two-dimensional weak anti-localization effects, confirming topologically protected surface conduction.

Contribution

It provides experimental evidence linking surface states to magnetotransport phenomena in Bi2Te2Se nanoplates, advancing understanding of topological insulator properties.

Findings

Observation of two-dimensional weak anti-localization effect

Surface states are topologically protected

Gate-dependent charge transport confirmed

Abstract

Single-crystalline Bi2Te2Se nanoplates with thicknesses between 8 and 30 nm and lateral sizes of several micrometers were synthesized by a vapour-solid growth method. Angle-dependent magnetoconductance measurements on individual nanoplates revealed the presence of a two-dimensional weak anti-localization effect. In conjunction with gate-dependent charge transport studies performed at different temperatures, evidence was gained that this effect originates from the topologically protected surface states of the nanoplates.