title: Theory of a competitive spin liquid state for weak Mott insulators on the triangular lattice.
abstract: We propose a novel quantum spin liquid state that can explain many of the intriguing experimental properties of the low-temperature phase of the organic spin liquid candidate materials κ-(BEDT-TTF)2Cu2(CN)3 and EtMe3Sb[Pd(dmit)2]2. This state of paired fermionic spinons preserves all symmetries of the system, and it has a gapless excitation spectrum with quadratic bands that touch at momentum k[over →]=0. This quadratic band touching is protected by symmetries. Using variational Monte Carlo techniques, we show that this state has highly competitive energy in the triangular lattice Heisenberg model supplemented with a realistically large ring-exchange term.
authors.affiliation: Department of Physics, University of California, Santa Barbara, California 93106, USA.
authors.forename: Ryan V
authors.initials: RV
authors.lastname: Mishmash
authors.forename: James R
authors.initials: JR
authors.lastname: Garrison
authors.forename: Samuel
authors.initials: S
authors.lastname: Bieri
authors.forename: Cenke
authors.initials: C
authors.lastname: Xu