报告题目：非平衡结晶过程的动力学路径及设计原理Dynamical Pathways and Design Principles of Nonequilibrium Crystallization
报告人：谭鹏
时间：2026年10月20日9:55-10:40
地点：1100号校区达理楼一楼报告厅
摘要：Crystallization is conventionally described as a thermally activated process governed by nucleation barriers and diffusive growth. However, far from equilibrium, crystallization may proceed through multiple competing metastable states, making the actual transformation strongly pathway dependent. In this talk, I will discuss our recent studies of nonequilibrium crystallization from the perspective of dynamical pathways. Single-particle observations first revealed nonclassical nucleation involving precursor structures and cross-symmetry structural transformations. We then showed that confinement and curvature can reorganize defects and select crystallization morphologies. At ultralow temperatures, crystals can grow from glassy states through cooperative, nearly diffusionless ordering, demonstrating that crystallization does not necessarily require long-range particle diffusion. More recently, we found that impurities can induce a bifurcation between continuous growth and melting-recrystallization pathways. Finally, dual-symmetry-guided assembly demonstrates that sparse structural information can reshape pathway accessibility and efficiently guide the formation of complex lattices. Together, these results suggest a general picture in which nonequilibrium crystallization is governed not only by thermodynamic driving forces, but also by the accessibility and connectivity of dynamical pathways in a complex metastable landscape. This perspective provides a route from understanding naturally selected crystallization pathways toward their active design and control.
报告人简介：谭鹏，复旦大学物理学系教授。2010年获复旦大学凝聚态物理博士学位，随后在香港中文大学从事博士后研究，2014年回国在复旦大学开展独立科研工作。长期从事非平衡结晶、玻璃态动力学及复杂体系结构与动力学研究，在非经典形核、限域结晶、玻璃态结晶、多层级弛豫和结晶路径调控等方面开展了系列工作。相关成果发表于 Nature、Nature Physics、Nature Materials 等期刊。现主持国家自然科学基金青年科学基金项目（A类）等科研项目。
