2005/03/12 by Katarzyna Czajka, Maciej M. Maska, Maciej M. Maśka +3 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.72.035320
published as Phys. Rev. B 72, 035320 (2005) · 9 pages, 9 figures, revtex
arxiv created 2005/03/12 · openalex publication_date 2005/07/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The properties of nanoscopic rings with electronic correlations and impurities are analyzed numerically by means of two methods. First, we carry out exact diagonalization of one-dimensional rings that consist of up to several lattice sites. Then, we perform the Bogoliubov--de Gennes equation studies of finite-width rings consisting of a few hundred sites. Results obtained from both approaches are shown to be consistent. We demonstrate how the system properties 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.