Composite fermions and quartets in the Fermi-Bose mixture with attractive interaction between fermions and bosons

Details Composite fermions and quartets in the Fermi-Bose mixture with attractive interaction between fermions and bosons Composite fermions and quartets in the Fermi-Bose mixture with attractive interaction between fermions and bosons

2002-09-20

arxiv.org/abs/cond-mat/0209481v2

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 2 figures

Scientific paper

We consider a model of Fermi-Bose mixture with strong hard-core repulsion between particles of the same sort and attraction between particles of different sorts. In this case, besides the standard anomalous averages of the type $$; $$ and $$, a pairing between fermion and boson of the type $bc$ is possible. This pairing corresponds to a creation of composite fermions in the system. At low temperatures and equal densities of fermions and bosons composite fermions are further paired in quartets. Our investigations are important for high-$T_c$ superconductors and in connection with recent observation of weakly bound dimers in magnetic traps at ultralow temperatures.