Crossover from Cooper pairs to composite bosons: A generalized RPA analysis of collective excitations

Lotfi Belkhir, Mohit Randeria
1994 Physical Review B (Condensed Matter)  
The evolution of the ground state and the excitation spectrum of the two and three dimensional attractive Hubbard model is studied as the system evolves from a Cooper pair regime for weak attraction to a composite boson regime for a strong attraction.
doi:10.1103/physrevb.49.6829 pmid:10009407 fatcat:udnzrmzfhjhznmnmog3pba5igu