论文标题
从耗散到正常扩散在易于轴的海森堡自旋链中
From dissipationless to normal diffusion in easy-axis Heisenberg spin chain
论文作者
论文摘要
可集成的易于轴链的异常自旋扩散源自具有非零磁化的对称扇区的弹道传输。在引入破坏性性扰动（包括外部驾驶）时，弹道传输被所有磁化部门的正常耗散运输所取代。这种行为意味着可集成模型获得的扩散常数与自旋激发的扩散有关，而与自旋电导率无关。我们提出了封闭系统和驱动开放系统的数值结果，表明扩散常数显示出不连续的变化，这是扰动强度的功能。
The anomalous spin diffusion of the integrable easy-axis Heisenberg chain originates in the ballistic transport of symmetry sectors with nonzero magnetization. Ballistic transport is replaced by normal dissipative transport in all magnetization sectors upon introducing the integrability-breaking perturbations, including external driving. Such behavior implies that the diffusion constant obtained for the integrable model is relevant for the spread of spin excitations but not for the spin conductivity. We present numerical results for closed systems and driven open systems, indicating that the diffusion constant shows a discontinuous variation as the function of perturbation strength.
