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Quantum Critical Transition from Charge-ordered to Superconducting State in the Negative-U Extended Hubbard Model on a Triangular Lattice

Mazumdar, S., & Clay, R. T. (2008). Quantum Critical Transition from Charge-ordered to Superconducting State in the Negative-U Extended Hubbard Model on a Triangular Lattice. Phys. Rev. B. 77, 180515(R).

Abstract

We demonstrate a robust frustration-driven charge order to superconductivity transition in the half-filled negative-U extended Hubbard model. Superconductivity extends over a broad region of the parameter space. We argue that the model provides the correct insight to understanding unconventional superconductivity in the organic charge-transfer solids and other quarter-filled systems.