Premium
‘π‐state’ induced by impurities with a repulsive interaction
Author(s) -
Litak Grzegorz,
Krawiec Mariusz
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200460057
Subject(s) - pairing , impurity , superconductivity , condensed matter physics , coulomb , hubbard model , physics , phase (matter) , electron , state (computer science) , quantum mechanics , algorithm , computer science
We study the properties of a quantum impurity embedded in a superconducting host. The superconductor is described by the negative U Hubbard model while the impurity introduces a repulsive interaction to the system. We discuss the influence of this ‘on‐impurity’ Coulomb repulsion on the local properties (density of states, electron pairing) of the superconductor. We show the condition of π‐like behaviour, defined as two subsystems having a phase difference of π, in the system by using a proper combination of attractive pairing interaction and repulsive one located at impurity site. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)