非厄米协同诱导的Chern绝缘体

中文摘要 AI 辅助

传统Chern绝缘体依赖于通过磁场或合成规范场打破时间反演对称性。这里我们引入一种根本不同的范式：一个没有任何规范场的静态晶格，仅通过两个非厄米要素的协同作用——在位损耗和非互易耦合——就变成Chern绝缘体。单独任一效应都不足以；只有它们的协同作用才打开拓扑能隙，并产生具有非零Chern数的鲁棒手性边缘态。其潜在机制源于由损耗位点形成的非厄米手性分子，其动力学主导模式携带轨道角动量，在快速衰减自由度被消除后有效产生合成通量。我们的结果确立了非厄米协同作为无需外部场或时间调制即可诱导Chern拓扑的一种通用资源，为开放经典和量子系统中的拓扑相开辟了新途径。

英文摘要

Conventional Chern insulators rely on breaking time-reversal symmetry via magnetic fields or synthetic gauge fields. Here we introduce a fundamentally different paradigm: a static lattice without any gauge field becomes a Chern insulator solely through the cooperation of two non-Hermitian ingredients: on-site loss and non-reciprocal coupling. Neither effect alone suffices; only their synergy opens a topological gap and gives rise to robust chiral edge states with a nonzero Chern number. The underlying mechanism originates from a non-Hermitian chiral molecule formed by the lossy sites, whose dynamically dominant mode carries an orbital angular momentum that effectively generates a synthetic flux after the fast-decaying degrees of freedom are eliminated. Our results establish non-Hermitian cooperation as a versatile resource for inducing Chern topology without external fields or temporal modulations, opening a new route to topological phases in open classical and quantum systems.

发表机构

• Tongji University（同济大学）
• The Chinese University of Hong Kong（香港中文大学）
• Jiangsu University（江苏大学）
• Institute of Acoustics, Chinese Academy of Sciences（中国科学院声学研究所）

机构由 AI 辅助整理，请以论文原文为准。