Phase Diagram of the Attractive Hubbard Model with Inhomogeneous Interactions

Details Phase Diagram of the Attractive Hubbard Model with Inhomogeneous Interactions Phase Diagram of the Attractive Hubbard Model with Inhomogeneous Interactions

2008-09-11

arxiv.org/abs/0809.2046v1

Physics

Condensed Matter

Superconductivity

9 pages, 7 figures, to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.78.134503

The phase diagram of the attractive Hubbard model with spatially inhomogeneous interactions is obtained using a single site dynamical mean field theory like approach. The model is characterized by three parameters: the interaction strength, the active fraction (fraction of sites with the attractive interaction), and electron filling. The calculations indicate that in a parameter regime with intermediate values of interaction strength (compared to the bare bandwidth of the electrons), and intermediate values of the active fraction, "non-BCS" superconductivity is obtained. The results of this work are likely to be relevant to many systems with spatially inhomogeneous superconductivity such as strongly correlated oxides, systems with negative U centers, and, in future, cold atom optical lattices.

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