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arXiv 2007.03837cond-mat.dis-nn
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非厄米准周期系统中的多体局域化

Many-body localization in a non-Hermitian quasi-periodic system

Liang-Jun Zhai, Shuai Yin, Guang-Yao Huang

摘要:

在本研究中,相互作用,拓扑结构,准周期性和非厄米性之间的相互作用进行了研究。本文选用具有非对称跳跃和准周期势的一维格点上的硬核玻色子模型。该模型保持了时间反演对称性(TRS),表现出三种类型的相变:本征能实-复相变、拓扑相变和多体局域化(MBL)相变。对于实复跃迁,发现本征能的虚部总是被MBL抑制。此外,通过计算缠绕数,我们发现随着势振幅的增加,系统会发生拓扑相变,并且这种行为与单粒子系统有很大的不同。根据数值结果,我们推测这三种相变都发生在热力学极限的同一点上,准周期系统和无序系统的MBL相变应属于不同的普适类。最后,我们证明了这些相变可以深刻地影响非厄米多体系统的动力学。

英文摘要:

In the present study, the interplay among interaction, topology, quasiperiodicity, and non-Hermiticity is studied. The hard-core bosons model on a one-dimensional lattice with asymmetry hoppings and quasiperiodic onsite potentials is selected. This model, which preserves time-reversal symmetry (TRS), will exhibit three types of phase transition: real-complex transition of eigenenergies, topological phase transition and many-body localization (MBL) phase transition. For thereal-complex transition, it is found that the imaginary parts of the eigenenergies are always suppressed by the MBL. Moreover, by calculating the winding number, a topological phase transition can be revealed with the increase of potential amplitude, and we find that the behavior is quite different from the single-particle systems. Based on our numerical results, we conjecture that these three types of phase transition occur at the same point in the thermodynamic limit, and the MBL transition of quasiperiodic system and disordered system should belong to different universality classes. Finally, we demonstrate that these phase transitions can profoundly affect the dynamics of the non-Hermitian many-body system.

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