Transport in quasiperiodic interacting systems: From superdiffusion to subdiffusion
Transport in quasiperiodic interacting systems: From superdiffusion to subdiffusion
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DOI：
10.1209/0295-5075/119/37003
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发表时间：
2017-08-01
期刊：
影响因子：
1.8
通讯作者：
Karrasch, Christoph
中科院分区：
文献类型：
--
作者：
Bar Lev, Yevgeny;Kennes, Dante M.;Karrasch, Christoph
通过结合数值精确和重正化群技术，我们研究了受准周期势影响的一维相互作用系统中电子的非平衡输运。为此，我们计算均方位移的增长以及畴壁的熔化。虽然系统对于所有研究的参数都是不可积的，但我们观察到扩散传输的参数不存在有限区域。特别是，我们的模型显示了从超扩散到亚扩散的丰富动态行为。我们讨论了我们的结果对多体定位的一般问题的影响，特别强调了稀有区域格里菲斯的次扩散图。版权所有 (C) EPLA，2017
Using a combination of numerically exact and renormalization-group techniques we study the nonequilibrium transport of electrons in a one-dimensional interacting system subject to a quasiperiodic potential. For this purpose we calculate the growth of the mean-square displacement as well as the melting of domain walls. While the system is nonintegrable for all studied parameters, there is no finite region of parameters for which we observe diffusive transport. In particular, our model shows a rich dynamical behavior crossing over from superdiffusion to subdiffusion. We discuss the implications of our results for the general problem of many-body localization, with a particular emphasis on the rare region Griffiths picture of subdiffusion. Copyright (C) EPLA, 2017