Two-dimensional magnetotransport in Bi 2Te 2Se nanoplatelets

Abstract

Single-crystalline Bi 2Te 2Se 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. © 2012 American Institute of Physics.