Abstract
We examine how a superfluid state is approached in a system of localizedbosons (tightly bound electron pairs) in contact with a reservoir of itinerantfermions (electrons). Assuming spontaneous decay and recombination betweenthese two species, the initially localized states of the bosons change overinto free-particle–like propagating statesas the temperature is lowered and the superfluid transition at is approached. Concomitantly a pseudogap opens up in the fermionic density of states which deepens with decreasing temperature.
- Received 11 July 1994
DOI:https://doi.org/10.1103/PhysRevLett.74.4027
©1995 American Physical Society