  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.
