Periodically driven (Floquet) systems have attracted growing attention due to the emergence of intriguing phenomena that are absent in equilibrium physics. In this talk, I will present a new class of Floquet criticality discovered in our recent work. For generic driven Majorana fermion chains with chiral symmetry, we analytically demonstrate that Floquet driving can enrich the transition point, resulting in topologically distinct quantum critical lines that are absent in undriven systems. Furthermore, we provide an intuitive physical explanation for the underlying mechanism of the nontrivial topology at Floquet criticality and generalize our results to higher dimensions. This work not only extends the scope of topological physics in Floquet systems but also deepens our understanding of gapless topological phases of matter.

Reference: https://doi.org/10.48550/arXiv.2410.15395

报告人简介

周龙文，中国海洋大学教授，博士生导师。主要研究领域为驱动量子体系的拓扑、纠缠与动力学特征。在Floquet拓扑态、非厄米拓扑态、动力学量子相变、纠缠相变等研究方向取得多项进展，发表SCI论文50余篇，现主持国家自然科学基金面上项目一项，2024年入选ld体育网页端 青年访问科学家项目。

邀请人

田矗舜 研究员