Absence of full many-body localization in the disordered Hubbard chain
Absence of full many-body localization in the disordered Hubbard chain
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无序哈伯德链中缺乏完整的多体定位
DOI：
10.1103/physrevb.94.241104
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发表时间：
2016
影响因子：
3.7
通讯作者：
M. Znidaric
中科院分区：
文献类型：
--
作者：
P. Prelovšek;O. Barišić;M. Znidaric
我们提出的数值计算结果内的一维无序哈伯德模型的多体局域化（MBL）的几个特征指标。考虑到传统上研究的电荷无序（即，对于两个自旋取向具有相同的无序强度），我们发现，即使在强无序下，所有特征一致地表明，尽管电荷自由度是非遍历的，但自旋是离域的和遍历的。这表明在最近的冷原子实验中模拟的模型中没有完整的MBL。如果使用自旋相关无序，则可以恢复完全局域化。
We present numerical results within the one-dimensional disordered Hubbard model for several characteristic indicators of the many-body localization (MBL). Considering traditionally studied charge disorder (i.e., the same disorder strength for both spin orientations) we find that even at strong disorder all signatures consistently show that while charge degree of freedom is nonergodic, the spin is delocalized and ergodic. This indicates the absence of the full MBL in the model that has been simulated in recent cold-atom experiments. Full localization can be restored if spin-dependent disorder is used instead.