Imperfect nanorings with superconducting correlations

Abstract

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.

9 pages, 9 figures, revtex

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Cited by in corpus (9)

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• Emergence of $h/e$-period oscillations in the critical temperature of small superconducting rings threaded by magnetic flux
• Low-energy subgap states and the magnetic flux periodicity in d-wave superconducting rings
• Crossover from hc/e to hc/2e current oscillations in rings of s-wave superconductors
• Hofstadter butterfly for a finite correlated system
• Spin-orbit coupling effect on the persistent currents in mesoscopic ring with an Anderson impurity
• Flux Periodicities in Loops of Nodal Superconductors
• Probe-type of superconductivity by impurity in materials with short coherence length: the s-wave and $\eta$-wave phases study
• Transport properties of nanosystems with conventional and unconventional charge density waves