Superconductivity in strongly repulsive fermions: the role of kinetic-energy frustration |
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Authors: | Isaev L Ortiz G Batista C D |
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Affiliation: | Department of Physics, Indiana University, Bloomington, Indiana 47405, USA. |
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Abstract: | We discuss a physical mechanism of a non-BCS nature which can stabilize a superconducting state in a 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 arbitrarily large on-site repulsion. This phenomenon should be observable in experiments using fermionic atoms, e.g. 40K, in specially prepared optical lattices. |
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