标题： 非厄米耦合清洁和准周期链中的梳状效应 显示英文标题

标题： Non-Hermitian comb effect in coupled clean and quasiperiodic chains

摘要： 我们研究了通过链间跃迁与均匀链或干净链耦合的非厄米准周期链系统的局域化特性。 我们发现，在弱链间耦合极限下，这种耦合系统随着非厄米参数的增加，会从扩展相过渡到中间相。 然而，对于更强的链间耦合强度，扩展相会经历向局域相的转变，然后再过渡到中间相。 有趣的是，这种情况下的中间相表现出非厄米梳效应（NHCE），即局域态和扩展态共存，而不是被任何移动边分开，这在任何中间相中是传统的。 我们进一步表明，这种NHCE起源于准周期链的孤立位点极限，并提供了支持数值特征的解析解释。 显示英文摘要

摘要： We study localization properties in a system of non-Hermitian quasiperiodic chain coupled to a uniform chain or clean chain by inter-chain hopping. We find that in the limit of weak inter-chain coupling, such a coupled system exhibits transitions from delocalized to intermediate phase with increase in the non-Hermiticity parameter. However, for stronger inter-chain coupling strengths, the delocalized phase undergoes a transition to localized phase and then to an intermediate phase. Interestingly, the intermediate phase in this case exhibits the non-Hermitian comb effect (NHCE), i.e., the coexistence of localized and extended states rather than being well separated from each other by any mobility edge which is conventional in any intermediate phase. We further show that such a NHCE originates from the isolated site limit of the quasiperiodic chain and provide an analytical explanation supporting the numerical signatures.