激子极化子的扭致非厄米拓扑，这一成果由南洋理工大学苏锐小组经过不懈努力而取得。相关论文于2025年12月4日发表在《自然—物理学》杂志上。
本文通过实验证明了室温下液晶填充CsPbBr3钙钛矿微腔中由扭转自由度诱导的激子极化子的非厄米拓扑结构。双折射钙钛矿和液晶之间的几何扭曲作为一个自由度来调整极化络合物光谱，导致具有光谱缠绕拓扑和非互易性的非厄米带。
此外，诱导的非厄米拓扑在实际空间中产生了非厄米激子-极化子趋肤效应，表现为开放边界处的极化子积累。他们的发现为可调谐的非厄米现象和具有增强功能的片上极化器件的发展开辟了新的视角。
据介绍，非厄米物理学最近通过揭示增益和损失系统特有的一系列效应，改变了他们对拓扑的理解。在强耦合光-物质系统中实现非厄米拓扑不仅为增强拓扑现象的操纵提供了自由度，而且也有望开发片上有源光子器件。激子-极化子是激子和光子之间强耦合的准粒子，具有固有的非厄米特征。然而，由于实现非互易性的挑战，对非厄米拓扑及其相关输运特征的实验观察仍然很有限。
附：英文原文
Title: Twist-induced non-Hermitian topology of exciton–polaritons
Author: Liang, Jie, Zheng, Hao, Jin, Feng, Bao, Ruiqi, Dini, Kevin, Ren, Jiahao, Liu, Yuxi, Krl, Mateusz, Ostrovskaya, Elena A., Estrecho, Eliezer, Zhang, Baile, Liew, Timothy C. H., Su, Rui
Issue&Volume: 2025-12-04
Abstract: Non-Hermitian physics has recently transformed our understanding of topology by uncovering a range of effects that are unique to systems with gain and loss. The realization of non-Hermitian topology in strongly coupled light–matter systems not only offers degrees of freedom for the enhanced manipulation of topological phenomena, but is also promising for developing on-chip active photonic devices. Exciton–polaritons—strongly coupled quasiparticles from excitons and photons—emerge as a promising candidate with intrinsic non-Hermitian features. However, limited by the challenges in achieving non-reciprocity, the experimental observation of non-Hermitian topology and its associated transport features has remained elusive. Here we experimentally demonstrate the non-Hermitian topology of exciton–polaritons induced by a twist degree of freedom in a liquid-crystal-filled CsPbBr3 perovskite microcavity at room temperature. The geometric twist between birefringent perovskites and liquid crystals acts as a degree of freedom to tailor the polaritonic complex spectra, leading to non-Hermitian bands with spectral winding topology and non-reciprocity. Furthermore, the induced non-Hermitian topology gives rise to the non-Hermitian exciton–polariton skin effect in real space, manifesting as polariton accumulation at open boundaries. Our findings open new perspectives on tunable non-Hermitian phenomena and the development of on-chip polaritonic devices with enhanced functionalities.
DOI: 10.1038/s41567-025-03115-0
Source: https://www.nature.com/articles/s41567-025-03115-0