|Title||Spin-triplet pairing instability of the spinon fermi surface in a U(1) spin liquid|
|Publication Type||Journal Article|
|Year of Publication||2007|
|Authors||V. M. Galitski, and Y B. Kim|
|Journal||Phys. Rev. Lett.|
|Keywords||2007, Single Fellow|
Recent experiments on the organic compound kappa-(ET)2Cu2(CN)3 have provided a promising example of a two-dimensional spin liquid state. This phase is described by a two-dimensional spinon Fermi sea coupled to a U(1) gauge field. We study Kohn-Luttinger-like pairing instabilities of the spinon Fermi surface due to singular interaction processes with twice-the-Fermi-momentum transfer. We find that under certain circumstances the pairing instability occurs in odd-orbital-angular momentum or spin-triplet channels. Implications to experiments are discussed.