期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.045702
关键词
-
资金
- NSF [DMR-1104708]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1104708] Funding Source: National Science Foundation
We study the challenging thermal phase transition to stripe order in the frustrated square-lattice Ising model with couplings J(1) < 0 ( nearest-neighbor, ferromagnetic) and J(2) > 0 ( second-neighbor, antiferromagnetic) for g = J(2)/vertical bar J(1)vertical bar > 1/2. Using Monte Carlo simulations and known analytical results, we demonstrate Ashkin-Teller criticality for g >= g*; i.e., the critical exponents vary continuously between those of the 4-state Potts model at g = g* and the Ising model for g -> infinity. Thus, stripe transitions offer a route to realizing a related class of conformal field theories with conformal charge c = 1 and varying exponents. The transition is first order for g < g* = 0.67 +/- 0.01, much lower than previously believed, and exhibits pseudo-first-order behavior for g* <= g less than or similar to 1.
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