Amperean pairing instability in the U1 spin liquid state with fermi surface and application to kappa-(BEDT-TTF)2Cu2(CN)3.

@article{Lee2007AmpereanPI,
  title={Amperean pairing instability in the U1 spin liquid state with fermi surface and application to kappa-(BEDT-TTF)2Cu2(CN)3.},
  author={Sung-Sik Lee and Patrick A. Lee and Todadri Senthil},
  journal={Physical review letters},
  year={2007},
  volume={98 6},
  pages={
          067006
        }
}
Recent experiments on the organic compound kappa-(BEDT-TTF)2Cu2(CN)3 raise the possibility that the system may be described as a quantum spin liquid. Here we propose a pairing state caused by the "Amperean" attractive interaction between spinons on a Fermi surface mediated by the U(1) gauge field. We show that this state can explain many of the observed low temperature phenomena and discuss testable consequences. 
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