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

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arxiv 1003.5207 v2 pith:TOHD5KLU submitted 2010-03-26 cond-mat.supr-con cond-mat.str-el

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

L. Isaev , G. Ortiz , C. D. Batista This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords frustrationkinetic-energyrepulsivestronglysuperconductivityarbitrarilyatomsconsidering
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

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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