Spin-triplet pairing instability of the spinon Fermi surface in a U(1) spin liquid

Abstract

Recent experiments on the organic compound κ-(ET)_2Cu_2(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/spin-triplet channels. Implications to experiments are discussed.

4 pages, 1 figure

References in corpus (5)

• U(1) Gauge Theory of the Hubbard Model : Spin Liquid States and Possible Application to k-(BEDT-TTF)_2 Cu_2 (CN)_3
• Mott Transition from a Spin Liquid to a Fermi Liquid in the Spin-Frustrated Organic Conductor kappa-(ET)2Cu2(CN)3
• Quantum critical behavior in itinerant electron systems -- Eliashberg theory and instability of a ferromagnetic quantum-critical point
• Amperean Pairing Instability in the U(1) Spin Liquid State with Fermi Surface and Application to $\kappa -(BEDT-TTF{)}_{2}C{u}_2(CN{)}_3$
• The Kohn-Luttinger Effect in Gauge Theories

Cited by in corpus (4)

• Low energy effective theory of Fermi surface coupled with U(1) gauge field in 2+1 dimensions
• Theory of a continuous Mott transition in two dimensions
• Stability of the U(1) spin liquid with spinon Fermi surface in 2+1 dimensions
• Paired electron pockets in the hole-doped cuprates