Superconductivity generated by coupling to a cooperon in a two-dimensional array of four-leg Hubbard ladders

  title={Superconductivity generated by coupling to a cooperon in a two-dimensional array of four-leg Hubbard ladders},
  author={Robert Konik and Thomas Maurice Rice and Alexei M. Tsvelik},
  journal={Physical Review B},
Starting from an array of four-leg Hubbard ladders weakly doped away from half-filling and weakly coupled by interladder tunneling, we derive an effective low-energy model which contains a partially truncated Fermi surface and a well-defined cooperon excitation formed by a bound pair of holes. An attractive interaction in the Cooper channel is generated on the Fermi surface through virtual scattering into the cooperon state. Although the model is derived in the weak coupling limit of a four-leg… 
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