Gigantic Surface Lifetime of an Intrinsic Topological Insulator

Author(s): Madhab Neupane, Su-Yang Xu, Yukiaki Ishida, Shuang Jia, Benjamin M. Fregoso, Chang Liu, Ilya Belopolski, Guang Bian, Nasser Alidoust, Tomasz Durakiewicz, Victor Galitski, Shik Shin, Robert J. Cava, and M. Zahid Hasan

Exceptionally long-lived excited surface states are found in the topological insulator Bi${}_2$Te${}_2$Se, with the state persisting for microseconds.

[Phys. Rev. Lett. 115, 116801] Published Wed Sep 09, 2015