title: Amperean pairing instability in the U1 spin liquid state with fermi surface and application to kappa-(BEDT-TTF)2Cu2(CN)3.
abstract: 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.
authors.affiliation: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Sung-Sik
authors.initials: SS
authors.lastname: Lee
authors.forename: Patrick A
authors.initials: PA
authors.lastname: Lee
authors.forename: T
authors.initials: T
authors.lastname: Senthil