Imperfect nanorings with superconducting correlations

Details Imperfect nanorings with superconducting correlations Imperfect nanorings with superconducting correlations

2005-03-12

arxiv.org/abs/cond-mat/0503300v1

Phys. Rev. B 72, 035320 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 9 figures, revtex

Scientific paper

10.1103/PhysRevB.72.035320

The properties of nanoscopic rings with electronic correlations and impurities are analyzed numerically by means of two complementary methods. Namely, we perform exact diagonalization of systems up to several lattice sites and Bogoliubov-de Gennes-equations studies of systems consisting of a few hundred sites. We demonstrate how the properties of the systems are affected by various configurations of impurities for both repulsive and attractive electron-electron interactions. In the case of attractive interaction we show that the nanoscopic properties are mainly determined by the competition between tendencies toward pairing and formation of the density waves. Since the impurities act as pinning centers for the density waves, their configuration determines the result of this competition.

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