Spin Bose-Metal and Valence Bond Solid phases in a spin-1/2 model with ring exchanges on a four-leg triangular ladder
arXiv:1009.1179 · doi:10.1103/PhysRevLett.106.157202
Abstract
We study a spin-1/2 system with Heisenberg plus ring exchanges on a four-leg triangular ladder using the density matrix renormalization group and Gutzwiller variational wave functions. Near an isotropic lattice regime, for moderate to large ring exchanges we find a spin Bose-metal phase with a spinon Fermi sea consisting of three partially filled bands. Going away from the triangular towards the square lattice regime, we find a staggered dimer phase with dimers in the transverse direction, while for small ring exchanges the system is in a featureless rung phase. We also discuss parent states and a possible phase diagram in two dimensions.
4 pages, 5 figures, v3 is the print version
References in corpus (7)
- 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
- On the stability of U(1) spin liquids in two dimensions
- Theory of a continuous Mott transition in two dimensions
- Effective spin model for the spin-liquid phase of the Hubbard model on the triangular lattice
- Strong-Coupling Phases of Frustrated Bosons on a 2-leg Ladder with Ring Exchange
- Spin coupling in zigzag Wigner crystals