Local impurity effects in superconducting graphene

T. O. Wehling; H. P. Dahal; A. I. Lichtenstein; A. V. Balatsky

doi:10.1103/PhysRevB.78.035414

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Local impurity effects in superconducting graphene

T. O. Wehling, H. P. Dahal, A. I. Lichtenstein, A. V. Balatsky

DOI 10.1103/PhysRevB.78.035414 · Physical Review B

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Abstract

We study the local electronic properties of superconducting graphene in presence of impurities. In particular, we consider the case of magnetic and nonmagnetic impurities being either strongly localized or acting as a potential averaged over one unit cell. The spin dependent local density of states (LDOS) is calculated and possibilities for identifying the superconducting order parameter in graphene by means of scanning tunneling experiments are pointed out. We show that the vanishing effective mass of the electrons results in no coherence peaks at the superconducting gap edge. A method for identifying magnetic scatterers even by non-spin-polarized scanning tunneling spectroscopy is given.