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

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.

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

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• Pairing from strong repulsion in triangular lattice Hubbard model
• Classical Antiferromagnetism in Kinetically Frustrated Electronic Models
• d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules
• A Simple Mechanism for Unconventional Superconductivity in a Repulsive Fermion Model
• Frustration and chirality in three-dimensional trillium lattices: Insights and Perspectives
• Unfrustrating the t-J Model: d-wave BCS Superconductivity in the $t^{\prime }$-$J_z$-$V$ Model