标题： 通过空间调制在Kitaev链中调控工程谐波发射 显示英文标题

标题： Engineering harmonic emission through spatial modulation in a Kitaev chain

摘要： 我们研究了二聚化Kitaev链中的高次谐波产生（HHG）。 模型中的二聚化通过一个由参数$\lambda \in [-1:1]$确定的位点相关调制势引入。 该参数还决定了跃迁幅度的强度，并调节系统的拓扑性质。 根据参数$\lambda$的不同，HHG发射光谱可以分为三个段。 第一段表现出两个平台结构，其中主要的平台来自于向手性伙伴态的跃迁，这与拓扑超导相中准粒子的行为一致。 第二段显示多个平台，中间态使得向更高传导带的不同跃迁路径成为可能。 最后，第三段呈现出更宽的平台，表明存在活跃的带间跃迁。 在$\lambda\leq0$区域内，我们观察到间隙态（MGSs）与体态发生杂化，抑制了之前观察到的谐波增强效应。 这突显了中间态的关键作用，尤其是在MGSs孤立的情况下。 这些结果表明，可以通过调制参数$\lambda$选择性地控制谐波发射轮廓，为调控拓扑系统中的HHG提供了新的前景。 显示英文摘要

摘要： We investigate High-harmonic generation (HHG) in a dimerized Kitaev chain. The dimerization in the model is introduced through a site-dependent modulating potential, determined by a parameter $\lambda \in [-1:1]$. This parameter also determines the strength of the hopping amplitudes and tunes the system's topology. Depending upon the parameter $\lambda$, the HHG emission spectrum can be classified into three segments. The first segment exhibits two plateau structures, with the dominant one resulting from transitions to the chiral partner state, consistent with quasiparticle behavior in the topological superconducting phase. The second segment displays multiple plateaus, where intermediate states enable various transition pathways to higher conduction bands. Finally, the third segment presents broader plateaus, indicative of active interband transitions. In the $\lambda\leq0$ regime, we observe the mid-gap states (MGSs) hybridize with the bulk, suppressing the earlier observed harmonic enhancements. This highlights the key role of the intermediate states, particularly when MGSs are isolated. These results demonstrate that harmonic emission profiles can be selectively controlled through the modulating parameter $\lambda$, offering new prospects for tailoring HHG in topological systems.