物理学院学术报告（第75期）

报告题目：有限温度下相互作用诱导的拓扑相变

报告专家：黄泽敏 博士    科隆大学

报告时间：2024年11月01日（周五）16:00

报告地点：理6栋302      邀请人：李铭

报告内容：

Peierls' argument states that one-dimensional systems with short-range interactions cannot undergo thermal phase transitions marked by local order parameters. In this talk, we will revisit this by employing a non-local order parameter. We will discuss a topological phase transition at finite temperatures within the Su-Schrieffer-Heeger chain subjected to repulsive Hubbard interactions. This transition is driven by the proliferation of domain walls, created by interactions and activated by thermal fluctuations. We interpret this phenomenon as the loss of a topologically protected edge mode, clearly defined in the thermodynamic limit. If time permits, I will briefly discuss how this kind of mixed-state topological phase in two dimensions connects to the decoding phase transition in the toric code.

专家简介：

黄泽敏是科隆大学博士后研究员。他在伊利诺伊州香槟分校获得博士学位，在中山大学获得理学学士学位。