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Phys Rev Lett. 2010 Feb 5;104(5):057001. Epub 2010 Feb 1.

Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator.

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1
Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.

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.

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