论文标题
旋转螺旋的流体动力放松
Hydrodynamic relaxation of spin helices
论文作者
论文摘要
由于最近的冷原子实验，我们研究了量子XXZ旋转链中自旋螺旋的松弛。实验观察到的旋转螺旋的松弛遵循的缩放定律在质量上与线性反应转运差异。我们构建了螺旋松弛的理论，将广义流体动力学（GHD）与扩散校正和局部密度近似相结合。尽管螺旋远离局部平衡（因此GHD不必先验），但我们的理论又繁殖了实验观察到的螺旋的松弛动力学。特别是，我们的理论解释了具有明显异常扩散的时间状态的存在，以及正各向异性方案之间的不对称性。
Motivated by recent cold atom experiments, we study the relaxation of spin helices in quantum XXZ spin chains. The experimentally observed relaxation of spin helices follows scaling laws that are qualitatively different from linear-response transport. We construct a theory of the relaxation of helices, combining generalized hydrodynamics (GHD) with diffusive corrections and the local density approximation. Although helices are far from local equilibrium (so GHD need not apply a priori), our theory reproduces the experimentally observed relaxational dynamics of helices. In particular, our theory explains the existence of temporal regimes with apparent anomalous diffusion, as well as the asymmetry between positive and negative anisotropy regimes.
