Pairing-bag excitations in small-coherence-length superconductors
A. R. Bishop, P. S. Lomdahl, J. R. Schrieffer, S. A. Trugman
DOI 10.1103/PhysRevLett.61.2709 · Physical Review Letters
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Abstract
Localized baglike solutions in the pairing theory of superconductivity are studied. Starting from the Bogoliubov–de Gennes equations on a two-dimensional square lattice for half-filled negative-U Hubbard model, cigar- and star-shaped bags are numerically obtained, inside of which the order parameter is reduced, self-consistently trapping an added quasiparticle. These nonlinear excitations are important when the coherence length is small as for the new high-temperature superconductors. Several experimental consequences are discussed.
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