期刊
PHYSICAL REVIEW LETTERS
卷 111, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.087203
关键词
-
资金
- GENCI-CCRT [2012050225]
- Indo-French Centre for the Promotion of Advanced Research (IFCPAR/CEFIPRA) [4504-1]
- French ANR program [ANR-08-JCJC-0056-01]
- National Science Foundation [NSF PHY11-25915]
We study a spin-1/2 SU(2) model on the honeycomb lattice with nearest-neighbor antiferromagnetic exchange J that favors Neel order and competing six-spin interactions Q that favor a valence-bond-solid (VBS) state in which the bond energies order at the columnar wave vector K = (2 pi/3; -2 pi/3). We present quantum Monte Carlo evidence for a direct continuous quantum phase transition between Neel and VBS states, with exponents and logarithmic violations of scaling consistent with those at analogous deconfined critical points on the square lattice. Although this strongly suggests a description in terms of deconfined criticality, the measured threefold anisotropy of the phase of the VBS order parameter shows unusual near-marginal behavior at the critical point.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据