Electrical resistance of individual defects at a topological insulator surface.

ABSTRACT: Three-dimensional topological insulators host surface states with linear dispersion, which manifest as a Dirac cone. Nanoscale transport measurements provide direct access to the transport properties of the Dirac cone in real space and allow the detailed investigation of charge carrier scattering. Here we use scanning tunnelling potentiometry to analyse the resistance of different kinds of defects at the surface of a (Bi_0.53Sb_0.47)₂Te₃ topological insulator thin film. We find the largest localized voltage drop to be located at domain boundaries in the topological insulator film, with a resistivity about four times higher than that of a step edge. Furthermore, we resolve resistivity dipoles located around nanoscale voids in the sample surface. The

SUBMITTER: Lupke F 

PROVIDER: S-EPMC5472778 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature