Edge states of Sr2RuO4 detected by in-plane tunneling spectroscopy

Phys Rev Lett. 2011 Aug 12;107(7):077003. doi: 10.1103/PhysRevLett.107.077003. Epub 2011 Aug 9.

Abstract

Tunneling spectroscopy has been performed on Sr(2)RuO(4) searching for the edge states peculiar to topological superconductivity. Conductance spectra exhibit broad humps with three types of peak shape: domelike peak, split peak, and two-step peak. By comparing the experiments with predictions for unconventional superconductivity, these varieties are shown to originate from multiband chiral p-wave symmetry with weak anisotropy of pair amplitude. The broad hump in the conductance spectrum is a direct manifestation of the edge state due to chiral p-wave superconductivity.