Enhancement of pair correlation in a one-dimensional hybridization model

Details Enhancement of pair correlation in a one-dimensional hybridization model Enhancement of pair correlation in a one-dimensional hybridization model

1999-03-10

arxiv.org/abs/cond-mat/9903166v1

PRB 59, 7393(1999)

Physics

Condensed Matter

Strongly Correlated Electrons

11 page revtex, no figure

Scientific paper

10.1103/PhysRevB.59.7393

We propose an integrable model of one-dimensional (1D) interacting electrons coupled with the local orbitals arrayed periodically in the chain. Since the local orbitals are introduced in a way that double occupation is forbidden, the model keeps the main feature of the periodic Anderson model with an interacting host. For the attractive interaction, it is found that the local orbitals enhance the effective mass of the Cooper-pair-like singlets and also the pair correlation in the ground state. However, the persistent current is depressed in this case. For the repulsive interaction case, the Hamiltonian is non-Hermitian but allows Cooper pair solutions with small momenta, which are induced by the hybridization between the extended state and the local orbitals.

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