期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.127205
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资金
- NSF [DMR-0907500, DMR-1161348, DMR-0819860]
- Direct For Mathematical & Physical Scien [1161348] Funding Source: National Science Foundation
- Division Of Materials Research [1161348] Funding Source: National Science Foundation
Using the density matrix renormalization group, we investigate the S = 1/2 Heisenberg model on the honeycomb lattice with first (J(1)) and second (J(2)) neighbor interactions. We are able to study long open cylinders with widths up to 12 lattice spacings. For J(2)/J(1) near 0.3, we find an apparently paramagnetic phase, bordered by an antiferromagnetic phase for J(2) less than or similar to 0.26 and by a valence bond crystal for J(2) greater than or similar to 0.36. The longest correlation length that we find in this intermediate phase is for plaquette valence bond order. This correlation length grows strongly with cylinder circumference, indicating either quantum criticality or weak plaquette valence bond order. DOI: 10.1103/PhysRevLett.110.127205
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