期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.157202
关键词
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资金
- NSF [DMR-0529399, DMR-0611562, 0906816, MRI-0958596, DMR-0907145]
- A. P. Sloan Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906816] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [907145] Funding Source: National Science Foundation
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.
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