A mechanism for pair formation in strongly correlated systems

Details A mechanism for pair formation in strongly correlated systems A mechanism for pair formation in strongly correlated systems

2010-02-09

arxiv.org/abs/1002.1817v2

Mod Phys Lett B25, 1167 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, corrected some notations and made some clarifications

Scientific paper

We start from a Hamiltonian describing non-interacting fermions and add bosons to the model, with a Jaynes-Cummings-like interaction between the bosons and fermions. Because of the specific form of the interaction the model can be solved exactly. In the ground state, part of the electrons form bound pairs with opposite momentum and spin. The model also shows a gap in the kinetic energy of the fermions, but not in the spectrum of the full Hamiltonian. This gap is not of a mean-field nature, but is due to the Pauli exclusion principle.

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