arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1806.02599quant-phcond-mat.mes-hall
收藏

非厄米梯中莫尔条纹的动力学特征

Dynamical signature of moire pattern in non-Hermitian ladder

X. M. Yang, X. Z. Zhang, C. Li, Z. Song

摘要:

研究了由两个相互耦合的SSH链组成的非厄米莫尔超晶格系统的动力学行为。有两个主要的空间区域,其中系统是在完整的实谱对称相位,沿阶梯周期性地出现。我们发现,这两个量子相是二聚和四聚,这决定了不同的动力学行为。狄拉克几率可以周期振荡、二次增加和指数增加,分别对应于四聚区的不间断相、例外点和间断相。相比之下,狄拉克几率在二聚化区域可以表现出高频振荡。这些现象证明了动态签名,并提供了深刻的信息,在非厄米制度的莫尔图案。

英文摘要:

We study the dynamical behavior of a non-Hermitian moire superlattice system, which consists of two-coupled SSH chains with staggered imaginary on-site potentials. There are two main spatial regions, in which systems are in unbroken symmetric phases with fully real spectrum, appearing periodically along the ladder. We show that the two quantum phases are dimerized and tetramerized, which determine the distinct dynamical behaviors. Dirac probability can oscillate periodically, increase quadratically and increase exponentially, which correspond to the unbroken phase, exceptional point and the broken phase of the tetramerized region. In comparison, the Dirac probability can exhibit high-frequency oscillation in the dimerized region. These phenomena demonstrate the dynamical signature and provide insightful information of the moire pattern in the non-Hermitian regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑