title: Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator.
abstract: Bi2Se3 is one of a handful of known topological insulators. Here we show that copper intercalation in the van der Waals gaps between the Bi2Se3 layers, yielding an electron concentration of approximately 2x10{20} cm{-3}, results in superconductivity at 3.8 K in CuxBi2Se3 for 0.12<or=x<or=0.15. This demonstrates that Cooper pairing is possible in Bi2Se3 at accessible temperatures, with implications for studying the physics of topological insulators and potential devices.
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Y S
authors.initials: YS
authors.lastname: Hor
authors.forename: A J
authors.initials: AJ
authors.lastname: Williams
authors.forename: J G
authors.initials: JG
authors.lastname: Checkelsky
authors.forename: P
authors.initials: P
authors.lastname: Roushan
authors.forename: J
authors.initials: J
authors.lastname: Seo
authors.forename: Q
authors.initials: Q
authors.lastname: Xu
authors.forename: H W
authors.initials: HW
authors.lastname: Zandbergen
authors.forename: A
authors.initials: A
authors.lastname: Yazdani
authors.forename: N P
authors.initials: NP
authors.lastname: Ong
authors.forename: R J
authors.initials: RJ
authors.lastname: Cava