Electronic transport in graphene decorated with Bi2Te3 nanoparticles

We investigate the electronic transport in monolayer graphene Hall bars in which the graphene surface is carefully cleaned and then decorated with a dilute coating of Bi2Te3 nanoparticles. The devices include both monolayer-on-silicon oxide and monolayer-on-boron nitride variants. The Bi2Te3 nanoparticles are high quality with few defects, and mono-disperse with a diameter of approximately 15 nm. Initial measurements were made on graphene with a low coverage of ~1 nanoparticle per 10^4 nm^2, and indicate transport not dissimilar from standard for graphene. Upon annealing the sample in Ar to promote removal of the nanoparticle polymer coating, a small leftward shift indicating electron doping was observed. Results in devices with higher nanoparticle densities will be presented.