Amperean Pairing Instability in the U(1) Spin Liquid State with Fermi Surface and Application to $\kappa -(BEDT-TTF{)}_{2}C{u}_2(CN{)}_3$

Abstract

Recent experiments on the organic compound $\kappa -(BEDT-TTF{)}_{2}C{u}_2(CN{)}_3$ 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.

4+ pages, 1 fig

References in corpus (4)

• 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
• Mott Transition, Antiferromagnetism, and d-wave Superconductivity in Two-Dimensional Organic Conductors
• Emergence of inhomogeneous moments from spin liquid in the triangular-lattice Mott insulator $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$

Cited by in corpus (13)

• 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
• Global phase diagrams of frustrated quantum antiferromagnets in two dimensions: doubled Chern-Simons theory
• Stability of the U(1) spin liquid with spinon Fermi surface in 2+1 dimensions
• SU(2) gauge theory of the Hubbard model and application to the honeycomb lattice
• Dynamics and transport of the Z_2 spin liquid: application to kappa-(ET)2Cu2(CN)3
• Transport Properties of a spinon Fermi surface coupled to a U(1) gauge field
• Power-law Conductivity inside the Mott gap: application to $\kappa -(BEDT-TTF{)}_{2}C{u}_2(CN{)}_3$
• Spin-triplet pairing instability of the spinon Fermi surface in a U(1) spin liquid
• Paired electron pockets in the hole-doped cuprates
• Field-induced staggered magnetic moment in the quasi-two-dimensional organic Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl
• Insulator-metal transition on the triangular lattice
• Susceptibility of a spinon Fermi surface coupled to a U(1) gauge field