S-wave superconductivity near a surface

Details S-wave superconductivity near a surface S-wave superconductivity near a surface

2003-03-04

arxiv.org/abs/cond-mat/0303069v1

Physica C 384, 356 (2003)

Physics

Condensed Matter

Superconductivity

9 pages, 13 figures

Scientific paper

10.1016/S0921-4534(02)01972-X

We study the superconducting order parameter near a surface with the Bogoliubov-de Gennes formalism. For definiteness we use the attractive Hubbard model. Near a surface, the order parameter and the density distribution exhibit ``Friedel-like'' oscillations. Although the local density of states is quite different from that in the bulk, the energy gap in the spectrum on a surface is almost the same as the bulk value. In the low-density limit, however, the energy gap tends to vanish on a surface.

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