Superconductivity inCuxBi2Se3and its Implications for Pairing in the Undoped Topological Insulator

著者: Y. S. Hor, A. J. Williams, J. G. Checkelsky, P. Roushan, Jungpil Seo, Qiunan Xu, H.W. Zandbergen, Ali Yazdani, N. P. Ong, R. J. Cava - Physical Review Letters 2010 被引用: 1,038

${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ is one of a handful of known topological insulators. Here we show that copper intercalation in the van der Waals gaps between the ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ layers, yielding an electron concentration of $\ensuremath{\sim}2\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}3}$, results in superconductivity at 3.8 K in ${\mathrm{Cu}}_{x}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ for $0.12\ensuremath{\le}x\ensuremath{\le}0.15$. This demonstrates that Cooper pairing is possible in ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ at accessible temperatures, with implications for studying the physics of topological insulators and potential devices.