One-particle excitations in strong-coupling superconductors: A new realization of thet-Jmodel
- 1 December 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (16) , 10241-10244
- https://doi.org/10.1103/physrevb.42.10241
Abstract
We study the one-particle excitations in strong-coupling superconductors described by a negative-U Hubbard Hamiltonian. We show that the problem of single-particle excitation can be mapped onto that of a hole in a polarized antiferromagnetic Heisenberg model. We discuss—using a self-consistent diagrammatic approach—the distortion of the superfluid order parameter in the vicinity of the quasiparticle and the connection with the pairing-bag problem.Keywords
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