报告题目：Revisiting the Efimov Effect: Exact Renormalization and New Realizations

报告人：张鹏飞 副研究员（复旦大学）

报告时间：2026 年 1 月 30 日（周五）3 : 30-4 : 30

报告地点：北洋园校区 49 教 410 室

报告摘要：

      When two non-relativistic particles interact resonantly in three dimensions, an infinite tower of three-body bound states emerges, exhibiting discrete scale invariance. This universal phenomenon, known as the Efimov effect, has attracted significant attention across various fields, including atomic, nuclear, condensed matter, and particle physics. In this talk, I will present our recent theoretical progress on the Efimov effect. In the first part, we establish the exact renormalization relation for the three-body parameter and determine its connection to the energies of Efimov bound states. These results are corroborated by high-precision numerical simulations. In the second part, we explore few-magnon physics in long-range quantum spin chains, which are relevant to trapped-ion systems. Unlike non-relativistic particles with quadratic dispersion, long-range interactions give rise to a generic dispersion relation of the form ω ∼ k^z. This makes such systems a novel platform for realizing universal few-body physics beyond the traditional paradigm. In particular, we show that the Efimov effect for magnons can emerge in one, two, and three dimensions.

报告人简介：

       张鹏飞，复旦大学准聘副教授。2015年于清华大学物理学系获得学士学位，2019年于清华大学高等研究院获得博士学位，2019-2022任加州理工学院博士后。研究方向为理论凝聚态物理与冷原子物理，涵盖：多体量子信息的动力学，全息量子物质，超冷原子气体和量子机器学习。