Ultrathin Topological Insulator Bi<sub>2</sub>Se<sub>3</sub> Nanoribbons Exfoliated by Atomic Force Microscopy
Ultrathin Topological Insulator Bi<sub>2</sub>Se<sub>3</sub> Nanoribbons Exfoliated by Atomic Force Microscopy
Ultrathin topological insulator nanostructures, in which coupling between top and bottom surface states takes place, are of great intellectual and practical importance. Due to the weak van der Waals interaction between adjacent quintuple layers (QLs), the layered bismuth selenide (Bi2Se3), a single Dirac-cone topological insulator with a large bulk gap, …