Garcia-Garcia, Antonio and Urbina, Juan Diego and Richter, Klaus and Yuzbashyan, Emil and Altshuler, Boris
BCS superconductivity in metallic nanograins: Finite-size corrections, low-energy excitations, and robustness of shell effects.
Physical Review B (PRB) 83, 014510.
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Other URL: http://prb.aps.org/abstract/PRB/v83/i1/e014510, http://arxiv.org/abs/0911.1559
We combine the BCS self-consistency condition, a semiclassical expansion for the spectral density and interaction matrix elements to describe analytically how the superconducting gap depends on the size and shape of a two- and three-dimensional superconducting grain. In chaotic grains mesoscopic fluctuations of the matrix elements lead to a smooth dependence of the order parameter on the ...
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