Abstract
Motivated by recent discoveries of noncentrosymmetric superconductors, we investigate theoretically the impurity resonance states considering the spin-orbit coupling interaction. Due to the nodal structure of gap function originating from the interference between spin-triplet and spin-singlet components of the superconducting order parameters, we find that a single nonmagnetic impurity induced resonance states appear in the local density of state. In addition, we analyze the evolution of the local density of states for coexisting isotropic s-wave and p-wave superconducting states and compare with that of anisotropic s-wave and p-wave symmetries of the superconducting gap. We propose that the scanning tunneling microscopy can shed light on the particular structure of the superconducting gap in noncentrosymmetric superconductors.
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