title: Moiré superlattices at the topological insulator Bi2Te3.
abstract: We report on the observation of complex superlattices at the surface of the topological insulator Bi2Te3. Scanning tunneling microscopy reveals the existence of two different periodic structures in addition to the Bi2Te3 atomic lattice, which is found to strongly affect the local electronic structure. These three different periodicities are interpreted to result from a single small in-plane rotation of the topmost quintuple layer only. Density functional theory calculations support the observed increase in the DOS near the Fermi level, and exclude the possibility that strain is at the origin of the observed Moiré pattern. Exploration of Moiré superlattices formed by the quintuple layers of topological insulators holds great potential for further tuning of the properties of topological insulators.
authors: Solid-State Physics and Magnetism Section, KU Leuven, BE-3001 Leuven, Belgium.
authors: Koen
authors: K
authors: Schouteden
authors: Solid-State Physics and Magnetism Section, KU Leuven, BE-3001 Leuven, Belgium.
authors: Zhe
authors: Z
authors: Li
authors: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and Department of Physics, Nanjing University, Nanjing 210093, China.
authors: Taishi
authors: T
authors: Chen
authors: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and Department of Physics, Nanjing University, Nanjing 210093, China.
authors: Fengqi
authors: F
authors: Song
authors: Department of Physics, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
authors: Bart
authors: B
authors: Partoens
authors: Solid-State Physics and Magnetism Section, KU Leuven, BE-3001 Leuven, Belgium.
authors: Chris
authors: C
authors: Van Haesendonck
authors: Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA.
authors: Kyungwha
authors: K
authors: Park