Stability of Unconventional Superconductivity on Surfaces of Topological Insulators

作者：Ito Yuto^*; Yamaji Youhei; Imada Masatoshi

来源：Journal of the Physical Society of Japan, 2011, 80(6): 063704.

DOI：10.1143/JPSJ.80.063704

• topological insulator
• helical Dirac electron
• unconventional superconductivity
• impurity scattering
• time reversal symmetry

Superconductivity on the surface of topological insulators is known to be anisotropic and unconventional in that the symmetry is the mixture of s-wave and nodeless p-wave component under certain conditions. In contrast to Anderson's theorem for the insensitivity of the s-wave superconducting critical temperature to the nonmagnetic (time-reversal symmetric (TRS)) impurities, anisotropic superconductors including nodeless p-wave one are in general fragile even with small concentration of the TRS impurities. By employing the Abrikosov-Gor'kov theory, we clarify that this type of unconventional superconductivity emergent on the surface state of the strong topological insulators robustly survive against TRS impurities.

• 出版日期2011-6