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Friedel oscillations and superconducting gap enhancement by impurity scattering

Stosiek, Matthias ; Baretzky, Clemens ; Balashov, Timofey ; Evers, Ferdinand ; Wulfhekel, Wulf


Experiments observe an enhanced superconducting gap over impurities as compared to the clean-bulk value. In order to shed more light on this phenomenon, we perform simulations within the framework of Bogoliubov???de Gennes theory applied to the attractive Hubbard model. The simulations qualitatively reproduce the experimentally observed enhancement effect; it can be traced back to an increased ...


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