报告题目：Interaction-induced topological pumping

报  告 人：柯勇贯（副教授）

报告日期：2025年8月19日 星期二

报告时间：上午10:30-11:30

报告地点：激光光谱研究所三层报告厅

报告简介：

       Topological pumping, particle transport protected by topological properties of space-time modulation, can be roughly classified as bulk Thouless pumping and topological pumping of edge states.  The interplay between topology and particle-particle interaction gives rise to novel correlated topological transport. In this talk, I will show how the interaction induced correlated topological pumping with initial bulk and edge states, respectively.  For the case of bulk Thouless pumping, we predict a novel type of multiparticle states in the modulated Bose-Hubbard model that can be associated with the concept of bound state in continuum (BIC). Under periodic boundary conditions, a so-called quasi-BIC appears as a bound pair residing in a standing wave formed by the third particle. We demonstrate that the Thouless pumping of the quasi-BICs can be realized by modulating the onsite interactions in space and time. In the case of topological pumping of edge states, as interaction increases, pumping dynamics changes from symmetry, asymmetry, hybrid of bulk and edge soltons to self-trap. We find that particle-particle interaction breaks the symmetry of the energy spectrum, which makes the topological pumping from the left to the right edges differ from the inverse process. We also find a hybrid topological pumping of edge and bulk solitons after multiple pumping cycles, which can be a new pattern of topological pumping.

报告人简介：

       柯勇贯，深圳大学特聘研究员、博士生导师。2013年、2018年分别从中山大学获得学士学位和博士学位。2018-2020年在中山大学与澳大利国立大学从事联合博士后工作，2021年转聘为中山大学副教授。2024年加入深圳大学。主要基于原子-光子体系研究拓扑量子物态，发展了多粒子拓扑能带和拓扑反能带等理论方法，突破了传统单粒子拓扑能带理论的限制。已在Phys. Rev. Lett.、Nature Communications、Laser & Photonics Reviews等高水平国际期刊发表SCI论文50余篇，Google学术被引1400余次。主持国家自然科学基金青年项目和面上项目、博士后国际交流计划派出项目、广东省面上基金项目各1项。