Bulk Band Gap and Surface State Conduction Observed in Voltage-Tuned Crystals of the Topological Insulator Bi${}_2$Se${}_3$

J. G. Checkelsky, Y. S. Hor, R. J. Cava +1

We report a transport study of exfoliated few monolayer crystals of topological insulator Bi${}_2$Se${}_3$ in an electric field effect (EFE) geometry. By doping the bulk crystals with…