title: Weak antilocalization and electron-electron interaction in coupled multiple-channel transport in a Bi2Se3 thin film.
abstract: The electron transport properties of a topological insulator Bi2Se3 thin film are studied in Hall-bar geometry. The film with a thickness of 10 nm is grown by van der Waals epitaxy on fluorophlogopite mica and Hall-bar devices are fabricated from the as-grown film directly on the mica substrate. Weak antilocalization and electron-electron interaction effects are observed and analyzed at low temperatures. The phase-coherence length extracted from the measured weak antilocalization characteristics shows a strong power-law increase with decreasing temperature and the transport in the film is shown to occur via coupled multiple (topological surface and bulk states) channels. The conductivity of the film shows a logarithmical decrease with decreasing temperature and thus the electron-electron interaction plays a dominant role in quantum corrections to the conductivity of the film at low temperatures.
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China. hqxu@pku.edu.cn syhuang@pku.edu.cn.
authors.forename: Yumei
authors.initials: Y
authors.lastname: Jing
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China. hqxu@pku.edu.cn syhuang@pku.edu.cn.
authors.forename: Shaoyun
authors.initials: S
authors.lastname: Huang
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Jinxiong
authors.initials: J
authors.lastname: Wu
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Yunfan
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Hailin
authors.initials: H
authors.lastname: Peng
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Zhongfan
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China. hqxu@pku.edu.cn syhuang@pku.edu.cn and Division of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden.
authors.forename: H Q
authors.initials: HQ
authors.lastname: Xu