Superconductivity in strongly repulsive fermions: the role of kinetic-energy frustration

Details Superconductivity in strongly repulsive fermions: the role of kinetic-energy frustration Superconductivity in strongly repulsive fermions: the role of kinetic-energy frustration

2010-03-26

arxiv.org/abs/1003.5207v2

Phys. Rev. Lett. 105, 187002 (2010)

Physics

Condensed Matter

Superconductivity

TeXLive (Unix), revtex4, 4 pages, 3 figures

Scientific paper

We discuss a physical mechanism of a non-BCS nature which can stabilize a superconducting state in a {\it strongly repulsive} electronic system. By considering the two-dimensional Hubbard model with spatially modulated electron hoppings, we demonstrate how kinetic-energy frustration can lead to robust d-wave superconductivity at {\it arbitrarily} large on-site repulsion. This phenomenon should be observable in experiments using fermionic atoms, e.g. ${}^{40}K$, in specially prepared optical lattices.

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