arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0705.2142cond-mat.stat-mech
收藏

一级相变点的非平衡临界弛豫

Nonequilibrium critical relaxation at a first-order phase transition point

Michel Pleimling, Ferenc Igloi

摘要:

数值研究了具有两自旋和四自旋混合相互作用的伊辛模型在从高温相到一级相变点的突然猝灭后的非平衡动力学行为.自相关函数接近其极限值,给出了在有序相的磁化强度在过渡点,m_c,通过拉伸指数衰减。另一方面,从与磁化强度m_i不相关的初始状态开始,磁化强度的弛豫接近于m_c(对于m_i>0.5)或零(对于m_i<0.5)。对于小的m_i和稍大于0.5的m_i,磁化弛豫表现出渐近幂律时间依赖性,因此从非平衡观点看,转变是连续的。

英文摘要:

We study numerically the nonequilibrium dynamical behavior of an Ising model with mixed two-spin and four-spin interactions after a sudden quench from the high-temperature phase to the first-order phase transition point. The autocorrelation function is shown to approach its limiting value, given by the magnetization in the ordered phase at the transition point, m_c, through a stretched exponential decay. On the other hand relaxation of the magnetization starting with an uncorrelated initial state with magnetization, m_i, approaches either m_c, for m_i>0.5, or zero, for m_i<0.5. For small m_i and for m_i slightly larger than 0.5 the relaxation of the magnetization shows an asymptotic power-law time dependence, thus from a nonequilibrium point of view the transition is continuous.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑