Spin-charge separation and many-body localization
Spin-charge separation and many-body localization
复制标题
自旋电荷分离和多体定位
作者：
J. Zakrzewski;D. Delande
研究了自旋1/2费米子无序链的多体定域。在[物理学]中Rev. B \textbf{94}, 241104(2016)]，当上下分量都暴露在相同的强无序中时，作者观察到纠缠熵呈幂律增长，表明多体局部化不完全；密度（电荷）自由度具有局域性，而自旋自由度具有明显的非局域性。我们表明，这种类功率行为只是一种短暂的效应，并且在更长的时间内，增长是对数的，这表明自旋自由度也是局域化的，因此系统遵循标准的多体局域化方案。我们还研究了准周期无序的实验相关情况。
We study many-body localization for a disordered chain of spin 1/2 fermions. In [Phys. Rev. B \textbf{94}, 241104 (2016)], when both down and up components are exposed to the same strong disorder, the authors observe a power law growth of the entanglement entropy that suggests that many-body localization is not complete; the density (charge) degree of freedom is localized, while the spin degree of freedom is apparently delocalized. We show that this power-like behavior is only a transient effect and that, for longer times, the growth is logarithmic in time suggesting that the spin degree of freedom is also localized, so that the system follows the standard many-body localization scenario. We also study the experimentally relevant case of quasiperiodic disorder.