Levis Demian, Cugliandolo Leticia F, Foini Laura, Tarzia Marco
Université Pierre et Marie Curie-Paris 6, Laboratoire de Physique Théorique et Hautes Energies, 4, Place Jussieu, Tour 13, 5ème étage, 75252 Paris Cedex 05, France.
Université Pierre et Marie Curie-Paris 6, Laboratoire de Physique Théorique de la Matière Condensée, 4, Place Jussieu, Tour 12, 5ème étage, 75252 Paris Cedex 05, France.
Phys Rev Lett. 2013 May 17;110(20):207206. doi: 10.1103/PhysRevLett.110.207206. Epub 2013 May 14.
We use the sixteen-vertex model to describe bidimensional artificial spin ice. We find excellent agreement between vertex densities in 15 differently grown samples and the predictions of the model. Our results demonstrate that the samples are in usual thermal equilibrium away from a critical point separating a disordered and an antiferromagnetic phase in the model. The second-order phase transition that we predict suggests that the spatial arrangement of vertices in near-critical artificial spin ice should be studied in more detail in order to verify whether they show the expected space and time long-range correlations.
我们使用十六顶点模型来描述二维人工自旋冰。我们发现15个不同生长样本中的顶点密度与该模型的预测结果高度吻合。我们的结果表明，这些样本处于远离模型中无序相和反铁磁相临界点的常规热平衡状态。我们预测的二阶相变表明，对于接近临界的人工自旋冰，应更详细地研究顶点的空间排列，以验证它们是否呈现出预期的空间和时间长程相关性。
