论文标题
外部场中各向异性抗铁磁铁的关键动力学
Critical Dynamics of Anisotropic Antiferromagnets in an External Field
论文作者
论文摘要
在存在外部磁场的情况下，我们在数值上研究了三维各向异性抗铁磁体的非平衡临界动力学。该系统的相图表现出在两种位点相遇的两个临界线。交错的磁化顺序参数的非保存组件沿外部场的方向动态到磁化密度的保守分量。采用混合计算算法，该算法将可逆的旋转动力与松弛蒙特卡洛更新相结合，我们研究了C临界线的衰老缩放缩放动力学，从而确定了临界初始滑移，自相关和订单参数的临界初始性和衰老指数，从而验证了动态关键指数。我们通过研究临界点附近的特征旋转波频率的系统大小依赖性，并测量订单参数的动态临界指数，包括其在双临界点处的衰老比例，进一步探测了模型F临界线。
We numerically investigate the non-equilibrium critical dynamics in three-dimensional anisotropic antiferromagnets in the presence of an external magnetic field. The phase diagram of this system exhibits two critical lines that meet at a bicritical point. The non-conserved components of the staggered magnetization order parameter couple dynamically to the conserved component of the magnetization density along the direction of the external field. Employing a hybrid computational algorithm that combines reversible spin precession with relaxational Monte Carlo updates, we study the aging scaling dynamics for the model C critical line, identifying the critical initial slip, autocorrelation, and aging exponents for both the order parameter and conserved field, thus also verifying the dynamic critical exponent. We further probe the model F critical line by investigating the system size dependence of the characteristic spin wave frequencies near criticality, and measure the dynamic critical exponents for the order parameter including its aging scaling at the bicritical point.
